Thursday, September 9, 2010

Speed P6 2010 SA2 HHK P2 Q15

A car and a van started travelling from Town X to Town Y at the same time. The distance between the two towns was 225 km. Both vehicles did not change their speed. The car arrived at Town Y ¾ h earlier than the van. When the car reached Town Y, the van was still 45 km away from Town Y. What was the speed at which the car was travelling [4 marks][Answer given: 75 km/h]


3/4 h --> 45 km
1 h --> 45/0.75 = 60 km/h

225 - 45 = 180 km

60 km --> 1 h
180 km --> 180/60 x 1 = 3 h

225/3 = 75 km/h

It was 75 km/h.

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