Question

A person can swim in still water with velocity 10m/minute. If the river flows with velocity 4m/minute and width of the river is 500m, he can cross the river in the shortest time _____​

Answer 1

Answer:

because river velocity is zero in the north direction. now this velocity due noth will be maximum when @ tends to 90 degrees. hence he should move due north that is 90 degrees to the bank.

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Answer 2

Answer:

because river velocity is zero in the north direction. now this velocity due noth will be maximum when @ tends to 90 degrees. hence he should move due north that is 90 degrees to the bank.

Explanation:

Let the speed of the current==S

2 * [S + 3] ==5 * [3 - S], solve for S

S ==9 / 7 - km/h - speed of the current.