Question

A man rowed 3 miles upstream in 90 minutes.

IF the river flowed with a current of 2 miles per

hour, long did the man's return trip take?

Answer 1

tips?

Answer 2

put 90 minutes into hours so that it matches the rate 2 miles per hour

Answer 3

1.5 hours?

Answer 4

so the man rowed 2 miles in one hour?

Answer 5

Upstream--> Flowing against the current
So effective speed of the man upstream= Actual speed of man - Speed of current
Given 3 miles in 90mins (1.5hrs) , so effective speed=2 mph
Speed of current= 2mph
--> Actual speed of man= 4 mph

Downstream means flowing with current so
Effective speed downstream= Actual speed + Current speed
=6 mph
Hence time taken = 3miles/6 mph =30 minutes

Answer 6

ahh

Answer 7

wait

Answer 8

3

Answer 9

3 mph/6mph

Answer 10

30 minutess

Answer 11

is that really it?

Answer 12

next problem