A straight road connects points A and B. Car 1 travels from A to B and Car 2 travels from B to A, both leaving at the same time. After meeting each other, they take 45 minutes and 20 minutes, respectively, to complete their journeys. If Car 1 travels at the speed of 60 km/hr, then the speed of Car 2, in km/hr, is
Explanation:
Let the time taken for them to meet after starting from opposite ends be t mins.
Also, let speeds of Car 2 be b kmph.
Distance AM = 60 × t = b × 20 …(1)
Distance BM = b × t = 60 × 45 …(2)
(1) × (2)
⇒ t2 = 900
⇒ t = 30 minutes
From (2) we get,
60 × 30 = b × 20
⇒ b = 90 kmph
Hence, option (b).
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