Question
Car ‘R’ can cross a 900 metre long bridge in 30 seconds. Car ‘R’ is 180 metres ahead of car ‘S’ which is travelling in the same direction as that of car ‘R’ with a speed of 40 m/s. After how many seconds will car ‘S’ meet car ‘R’?
Solution
Speed of car ‘R’ = 900 ÷ 30 = 30 m/s So, relative speed of car ‘S’ with respect to car ‘R’ = 40 – 30 = 10 m/s Distance between the two cars = 180 metres So, time taken by car ‘S’ to meet car ‘R’ = 180 ÷ 10 = 18 seconds
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