A boat takes 5 hrs to travel 105 km downstream The speed of the boat in downstream is 1 4 times of t...........

Quantitative Aptitude (SBI-CL) Boats and Streams

A boat takes 5 hrs to travel 105 km downstream. The speed of the boat in downstream is 1.4 times of the speed of the boat in upstream. What is the speed of the current? (in kmph)

3.5

2.5

Explanation:

Speed of downstream= 105/5= 21 km/hr
Ratio between downstream & upstream
speed = 1.4 : 1
= 7 : 5
So 7 @ 21
5 @21/7 ×5 = 15 km/hr
So speed of stream=21-15/2 = 3 km/hr