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

Distance taken by boat is 24 km

Time taken is 5 hours

Speed of stream is 2 km/hr

Suppose that speed of boat in still water be p km/hr

Apply this formula you will get :-

Distance = Speed × Time

$\tt{\rightarrow\dfrac{Distance}{Speed} = Time}$

$\tt{\rightarrow\dfrac{24}{p-2} = 5}$

24 = 5(p - 2)

24 = 5p - 10

=> 5p = 34

$\tt{\rightarrow p = \dfrac{34}{5}}$

= 6.8 km\hr