A car travelling at 90 km/h is 500m behind another car travelling at 70km/h in the same direction. How long will it take for the first car to catch the second? (ans:1.5 minutes, just show me the method please)
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step number 1 you should subtract the speed of both car then you will get 20 km per hour 20 kilometre per hour upon 60 minutes then then you get 1 by 3 then divide that 3 by 2 because of we are travelling only 500 metre and 1 by 3 is a time of 1 kilometre so your time will be 1.5 minutes
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