{"id":42517,"date":"2023-04-02T10:22:16","date_gmt":"2023-04-02T04:52:16","guid":{"rendered":"https:\/\/icsesolutions.com\/?p=42517"},"modified":"2023-04-03T10:01:57","modified_gmt":"2023-04-03T04:31:57","slug":"ml-aggarwal-class-7-solutions-for-icse-maths-chapter-6-ex-6-4","status":"publish","type":"post","link":"https:\/\/icsesolutions.com\/ml-aggarwal-class-7-solutions-for-icse-maths-chapter-6-ex-6-4\/","title":{"rendered":"ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 6 Ratio and Proportion Ex 6.4"},"content":{"rendered":"

ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 6 Ratio and Proportion Ex 6.4<\/h2>\n

Question 1.
\nConvert the following speeds into m\/sec:
\n(i) 72 km\/h
\n(ii) 9 km\/h
\n(iii) 1.2 km\/minutes
\n(iv) 600 m\/hour
\nSolution:
\n(i) 72 km\/h
\n1 km = 1000 m
\nand 1 h = 3600 sec.
\n\"ML
\n\"ML
\n\"ML<\/p>\n

Question 2.
\nConvert the following speeds into km\/h:
\n(i) 15 m\/sec
\n(ii) 1.5 m\/sec
\nSolution:
\n(i) 15 m\/sec
\n\"ML<\/p>\n

Question 3.
\nWhich is greater- the speed of 30 m\/sec or 30 km\/h?
\nSolution:
\nWhich is greater
\nm\/s = \\(\\frac { 18 }{ 5 }\\) km\/h
\n30 km\/h = \\(\\frac { 18 }{ 5 }\\) \u00d7 30 = 108 km\/h
\nThat means 108 km cover in 1 hour 30 m\/sec is greater<\/p>\n

Question 4.
\nAn aeroplane is flying at a speed of 720 km\/h.
\n(i) If the aerial distance between two cities is 1800 km, how much time will the aeroplane take in crossing these cities?
\n(ii) How much distance does the aeroplane cover in 40 minutes?
\n(iii) How far will it fly in 15 seconds?
\nSolution:
\nSpeed of an aeroplane = 720 km\/h
\n(i) Distance between two cities = 1800 km
\nTime taken = \\(\\frac { D }{ S }\\)
\n= \\(\\frac { 1800 }{ 720 }\\) hours
\n= \\(\\frac { 5 }{ 2 }\\) hours
\n= 2\\(\\frac { 1 }{ 2 }\\) hours
\n(ii) Time = 40 min
\n= \\(\\frac { 40 }{ 60 }\\)
\n= \\(\\frac { 2 }{ 3 }\\) h
\nDistance travelled = Time \u00d7 Speed
\n= \\(\\frac { 2 }{ 3 }\\) \u00d7 720
\n= 480 km
\n(iii) Distance travelled in 15 sec = \\(\\frac { 15 }{ 3600 }\\) = \\(\\frac { 1 }{ 240 }\\) h
\n= \\(\\frac { 1 }{ 240 }\\) \u00d7 720
\n= 3 km<\/p>\n

Question 5.
\nA dog is walking at a speed of 6 km\/h.
\n(i) How much distance does it cover in 5 minutes?
\n(ii) How much time would it take to cover 200 metres?
\nSolution:
\nSpeed of a dog = 6 km\/h
\n(i) Distance travelled in 5 min. = \\(\\frac { 5 }{ 60 }\\) \u00d7 6 km
\n= \\(\\frac { 1 }{ 2 }\\) km
\n= 500 m
\n(ii) Time taken to cover 200 m
\n= \\(\\frac { 200 }{ 1000 }\\) km \u00d7 \\(\\frac { 1 }{ 6 }\\) h
\n= \\(\\frac { 1 }{ 30 }\\) h
\n= \\(\\frac { 1 }{ 30 }\\) \u00d7 60
\n= 2 minutes<\/p>\n

Question 6.
\nA swimming pool is 50 metres long. A boy can swim across the length and then return to his starting position in 5 minutes. What is his swimming speed in km\/h?
\nSolution:
\nLength of a swimming pool = 50 m
\nA boy crosses it and then come back
\nTotal distance covered = 50 \u00d7 2 = 100 m
\nTime taken = 5 minutes
\n\"ML<\/p>\n

Question 7.
\nA bus takes 48 minutes to cover a certain distance when travelling at a speed of 50 km\/h. How much time will it take to cover the same distance when travelling at a speed of 30 km\/h?
\nSolution:
\nSpeed of a bus = 50 km\/h
\nTime taken = 48 minutes
\nDistance = Speed \u00d7 Time
\n= 50 \u00d7 \\(\\frac { 48 }{ 60 }\\) km = 40 km
\nIn second time speed = 30 km\/h
\nTime taken = \\(\\frac { D }{ S }\\)
\n= \\(\\frac { 40 }{ 30 }\\)
\n= \\(\\frac { 4 }{ 3 }\\) h
\n= 1 hours \\(\\frac { 1 }{ 3 }\\) min.
\n= 1 hours \\(\\frac { 1 }{ 3 }\\) \u00d7 60 mm.
\n= 1 hour 20 minutes<\/p>\n

ML Aggarwal Class 7 Solutions for ICSE Maths<\/a><\/h4>\n","protected":false},"excerpt":{"rendered":"

ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 6 Ratio and Proportion Ex 6.4 Question 1. Convert the following speeds into m\/sec: (i) 72 km\/h (ii) 9 km\/h (iii) 1.2 km\/minutes (iv) 600 m\/hour Solution: (i) 72 km\/h 1 km = 1000 m and 1 h = 3600 sec. Question 2. Convert the following …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3034],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/42517"}],"collection":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/comments?post=42517"}],"version-history":[{"count":1,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/42517\/revisions"}],"predecessor-version":[{"id":158966,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/42517\/revisions\/158966"}],"wp:attachment":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/media?parent=42517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/categories?post=42517"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/tags?post=42517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}