Speed of a boat in still water is 5 km/hr and the speed of the stream is 1 km/hr. A man rows to a place…
Downstream the speeds add: 5 + 1 = 6 km/hr, so the 24 km take 24/6 = 4 hours. Upstream the stream works against the boat: 5 − 1 = 4 km/hr, so the return takes 24/4 = 6…
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Speed of a boat in still water is 5 km/hr and the speed of the stream is 1 km/hr. A man rows to a place at a distance of 24 km and comes back to the starting point. Find the total time taken by him.
Answer and explanation
Correct answer B
Downstream the speeds add: 5 + 1 = 6 km/hr, so the 24 km take 24/6 = 4 hours. Upstream the stream works against the boat: 5 − 1 = 4 km/hr, so the return takes 24/4 = 6 hours. The total time is 4 + 6 = 10 hours; 8 hours comes from using the downstream time for both legs.
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