1.

Two friends A and B are 30 km apart and they start simultaneously on motorcycles to meet each other. The speed of A is 3 times that of B. The distance between them decreases at the rate of 2 km per minute. Ten minutes after they start, A's vehicle breaks down and A stops and waits for B to arrive. After how much time (in minutes) A started riding, does B meet A ?

Answer»

15
20
25
30

Solution :Speed of B = V km/hr
Speed of A = 3 V km/hr
Given 4 V =`2 XX 60` km/hr
`rArr V = 30 ` km/hr
Distance covered by then after 10 min ` = 2 xx 10 = 20` km
so remaining distance = (30 - 20) km = 10 km
Time taken by B to cover10 km = `(10)/(30//60)=20 ` min.
TOTAL time = 20 + 10 = 30 min


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