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?

  • A 1:00 pm
  • B 12:00 noon
  • C 11:00 am
  • D 10:00 am
waec 2020mathematics

The correct answer is C. 11:00 am

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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