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WAEC Mathematics 2020 Paper

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Question : 16

Total: 48

Two buses start from the same station at 9.00am and travel in opposite directions along the same straight road. The first bus travel at a speed of 72 km/h and the second at 48 km/h. At what time will they be 240km apart?

1:00 pm
12:00 noon
11:00 am
10:00 am

Solution:

Concept:

When two objects move in opposite directions, their relative speed is the sum of their speeds.

Explanation:

First bus speed

= 72

km/h.

Second bus speed

= 48

km/h.

Relative speed

= 72 + 48 = 120

km/h.

Distance to be apart

= 240

km.

Time

= \frac{\text{Distance}}{\text{Relative speed}} = \frac{240}{120} = 2

hours.

Starting time is 9:00 am.

After 2 hours, the time will be 9:00 am

+

2 hours

= 11:00

am.

Answer:

C. 11:00 am

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