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Question

Hi,

Can help my DD on this question ?

John left Admiralty Town at 11.30 am for Bukit Town which was 35 km away. At the same time, Bala left Bukit Town for Admiralty Town . Bala’s speed was 16 km/h faster than John’s speed. They travelled along the same route. Fifteen minutes later, they were 10 km apart, after passing each other. find Bala’s average speed.

Thanks 

Answer

In 15 min, Bala would have travelled 16 × 1/4 = 4 km more than John.

In 15 min, John would have travelled  D km

and Bala would have travelled (D + 4) km.

Then D + D + 4 – 10 =35

D = 20.5

Bala’s speed = 24.5 ÷ 1/4 = 98 km/h

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