Two friends A and B are 30 km apart and they start simultaneously on m

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? (A) 15 (B) 20 (C) 25 (D) 30
Answer» Correct option (D) 30 Explanation: Speed of B = V km/hr Speed of A = 3V km/hr Given 4V = 2 × 60 km/hr ⇒ V = 30 km/hr Distance covered by then after 10 min = 2 × 10 = 20 km so remaining distance = (30 – 20) km = 10 km Time taken by B to cover 10 km = 10/30/60 = 20 min. Total time = 20 +10= 30min

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? (A) 15 (B) 20 (C) 25 (D) 30

Answer»

Correct option (D) 30

Explanation:

Speed of B = V km/hr

Speed of A = 3V km/hr

Given 4V = 2 × 60 km/hr

⇒ V = 30 km/hr

Distance covered by then after 10 min = 2 × 10 = 20 km

so remaining distance = (30 – 20) km = 10 km

Time taken by B to cover 10 km = 10/30/60 = 20 min.

Total time = 20 +10= 30min

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