What time will be taken by a boat to cover a distance of

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What time will be taken by a boat to cover a distance of 128 km along the stream, if speed of a boat in still water is 24 km/h and speed of stream is 8 km/h?

1. 8 km/h
2. 4 km/h
3. 7 km/h
4. 6 km/h

Correct Option: A

Downstream speed of boat = Speed of boat in still water + Speed of stream
= 24 + 8 = 32 km/h
∴ Required time = Distance/Speed downstream
= 128/32 = 4 km/h