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3 men can bow a boat in upstream 18 km in 3 hours. Find the speed of the boat in still water when 6 men will bow the same boat if the speed of the stream is 1 km/hr.

3 men can bow a boat in upstream 18 km in 3 hours. Find the speed of the boat in still water when 6 men will bow the same boat if the speed of the stream is 1 km/hr. Correct Answer None of these

Given:

3 men can bow a boat in upstream 18 km in 3 hours.

The speed of the stream is 1 km/hr.

Formula used:

Upstream speed = Speed of boat in still water - Speed of river

Downstream speed = Speed of boat in still water + Speed of river

Calculation:

Speed of boat with respect to stream = 18/3 = 6 km/hr

⇒ Speed of boat – Speed of stream = 6

⇒ Speed of boat = 6 + 1 = 7 km/hr

Speed of boat when 3 men bow the boat = 7 km/hr

Speed of boat when 6 men bow the boat = 7 × 6/3 = 14 km/h

∴ If 6 men will bow a boat then the speed of the boat will be 14 km/hr.

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