Question

A boat goes 60 km upstream in 4 hours and 50 km downstream in 2 hours, then the speed of the boat in still water is

A 10 km/hr Correct Answer Incorrect Answer
B 20 km/hr Correct Answer Incorrect Answer
C 25 km/hr Correct Answer Incorrect Answer
D 15 km/hr Correct Answer Incorrect Answer

Solution

Let the speed of boat = x and the speed of the stream = y 60/(x-y) = 4 ⇒ x-y = 15 50/(x+y) = 2 ⇒ x+y = 25 From above x = 20 km/hr

Practice Next
×
×