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If the sum of the upstream and downstream speeds is 36 km/h and the speed of the current is 3 km/h, then find the time taken to cover 52.5 km downstream.

1. 2 hr
2. 2.5 hr
3. 3 hr
4. 3.5 hr

Correct answer: 2.5 hr

Solution

If upstream speed is u and downstream speed is d, then u + d = 36 and d - u = 2×3 = 6. Solving gives d = 21 km/h. Time taken downstream = 52.5 ÷ 21 = 2.5 hours.

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