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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:

Let x be the time

Then 72x + 48x = 240

$\;\frac{120}{120} \times \;\frac{240}{120}$

x = 2hrs

9:00 + 2hrs = 11:00 am

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