Question

The speed of a boat along the stream is 12 km/h and against the stream is 8 km/h. The time taken by the boat to sail 24 km in still water is

• A. 2 hours
• B. 3 hours
• C. 2.4 hours
• D. 1.2 hours

Answer 1

Answer:

C. 2.4 hours

Let the speed of boat in still water be x kmph and that of current be y kmph., then

x + y = 12 -------------(1)

x – y = 8 --------------(2)

By solving (1) and (2) we get,

$2x=20$

$x=10kmph$

Required time = $\frac{24}{10}=2.4 hours$