Question

A boat can go 24km downstream and return in 5 hours. If the speed for the stream is 2km/hr,find the speed of boat in still water

Answer 1

Solution :-

Given : Distance travelled by boat = 24 km

Time taken = 5 hours

Speed of stream = 2 km/hr

Let us suppose that the speed of boat in still water be x km per hour.

Formula used :

Distance = Speed × Time

According to the question,

=> 24/(x + 2) = 5

=> 24 = 5(x + 2)

=> 24 = 5x + 10

=> 5x = 14

=> x = 14/5 = 2.8

Hence,

The speed of boat in still water = 2.8 km/hr

Answer 2

$\huge\textbf{Answer:-}$

According to the Given question:-

• 24km is the Distance travelled by boat .
• 5 hours is the total Time taken .
• 2 km/hr is the Speed of stream .

Let y be the speed of boat

Using Formula :----

Distance = Speed × Time

=24/(y - 2) = 5

=24 = 5(y - 2)

=24 = 5y - 10

=5y = 34

=>y = 34/5 = 6.8

Therefore,6.8 km/hr is the speed of boat in still water.