Question 94

If a boat goes upstream at a speed of 21 km/h and comes back the same distance at 28 km/h. What is the average speed (in km/hr) for the total journey?

Solution

Let say total distance is d km.

So, average speed=2d/(d/21+d/28) km/hr.

=(2d×84)/(4d+3d) km/hr

=24 km/hr.

B is correct choice.

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