Question

30% of 50 km is ____​

Answer 1

Answer:

15 km is your answer

Step-by-step explanation:

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Answer 2

Answer:

We can assume in this word problem that the train travels in one direction from a location we’ll call Point A to another location we will call Point B. It then returns along the same route in the opposite direction from Point B to Point A.

We don’t know the distance travelled, so let’s call the distance between Point A and Point B D for distance. The total distance is then 2D.

The average speed is:

average speed = (speed for the outbound trip + speed of the return trip) / 2 = (30 + 50) / 2 = 80 / 2 = 40 km/hour. The correct multiple choice answer is (d).

This works even if we don’t know the distance traveled because we know that half the distance was traveled at one speed, and the other, equal half was traveled at the other speed. So the unknown variable, D, for distance, cancels out and does not matter.