Question

Solve the following question and mark the best possible option.
A person can swim in still water at 4 km/hr. If the speed of water is 2 km/hr, how many hours will the man take to swim back against the current for 6 km?

Options

• 3

• 4

• `4 1/2`

• Data inadequate

Answer 1

Speed upstream = (4 -2)km/h = 2 km/h
Time taken to swim 6km agianst the current is 6 / (4-2) = 3 hours.