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A boat has to travel upstream 20 km distance from point X of a river to point Y. The total time taken by boat in travelling from point X to Y and Y to X is 41 min 40 s. What is the speed of the boat?


A) 66 km/h

B) 72 km/h

C) 48 km/h

D) Cannot be determined

Correct Answer:
D) Cannot be determined

Description for Correct answer:
Let x be the speed of the boat and y be the speed of the current.

Speed upstream = (x - y) km/h

Speed downstream = (x + y) km/h

According to the question,

\( \Large \frac{20}{x-y}+\frac{20}{x+y}=\frac{25}{36} \)

In this equation, there are two variables but only one equation.

So, the value of x cannot be determined.

Part of solved Boat and Stream questions and answers : >> Aptitude >> Boat and Stream




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