Gate2019 cs Q3

0. Two cars start at the same time from the same location and go in the same direction. The speed of the first car is 50 km/h and the speed of the second car is 60 km/h. The number of hours it takes for the distance between the two cars to be 20 km is ____________.

Answer
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Option : B
Explanation :
Speed of car A = 50 km/hr
Speed of car B = 60 km/hr
Since, both cars A and B are moving in same direction, the relative speed = 60 – 50 = 10 km/hr
Distance required between them = 20 km
Time = Distance/Speed = 20/10 = 2 hrs

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