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Question

Andy and Jerry cycled from Tampines Mall to Eastpoint at 11km/h and 8km/h respectively. Andy left Tampines Mall an hour later than Jerry. He arrived at Eastpoint 30mins earlier than Jerry. He long did Andy take?

 

Thanks!

Answer

0.5 + 1 = 1.5
11 units = 8 x (1u + 1.5) = 8 units + 12
1 unit = 4

Ans : 4 h.

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This is a Distance speed time question

    Time    Speed    Distance   
Andy   1u 11 11u
Jerry  1u + 1.5  8 8u + 12

 

11u = 8u + 12

11u – 8u = 12

3u = 12

1u = 12 ÷ 3 = 4 hour

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