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Grand Prix racing cars cover a 120 km race at the following
average speeds. How long do the first five cars take to
complete the race? Answer in minutes and seconds.
First 240 km/h
Second 220 km/h
Third 210 km/h
Fourth 205 km/h
Fifth 200 km/h

Respuesta :

First: 240km/1hour=120km/?hour
Cross multiply and divide
(120*1)/240= 0.5hour
Second: 220km/1hour=120km/?hour
Cross multiply and divide
(120*1)/220=0.545hour
Third: 210km/1hour=120km/?hour
Cross multiply and divide
(120*1)/210= 0.571hour
Fourth: 205km/1hour=120km/?hour
Cross multiply and divide
(120*1)/205= 0.585hour
Fifth: 200km/1hour=120km/?hour
Cross multiply and divide
(120*1)/200= 0.6hour

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