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A boat covers 144 km downstream and 224 km upstream in 8 hours and 16 hours respectively. Find the time taken by the boat to cover 128 km in still water.

1. 12 hours
2. 8 hours
3. 4 hours
4. 16 hours

Correct answer: 8 hours

Solution

Downstream speed = 144/8 = 18 km/h and upstream speed = 224/16 = 14 km/h. Speed in still water = (18 + 14)/2 = 16 km/h, so time for 128 km = 128/16 = 8 hours.

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