# Moderate Time, Speed & Distance Solved QuestionAptitude Discussion

 Q. The speed of a motor boat itself is 20 km/h and the rate of flow of the river is 4 km/h. Moving with the stream the boat went 120 km. What distance will the boat cover during the same time going against the stream?
 ✔ A. 80 km ✖ B. 180 km ✖ C. 60 km ✖ D. 100 km

Solution:
Option(A) is correct

Let the distance to be covered by the boat when it is travelling against the stream be $x$.

The boat goes down the river at a speed of $20+4=24$ km/h and up the river at a speed of $20–4=16$ km/h.

Since the time taken is same which is

$\dfrac{120}{24}=\dfrac{x}{16}$

Therefore, $x=80$ km