Sunday, March 29, 2009

Complex Speed 1 (Q)

Ali, Betty and Peter were on their way to a shopping centre. Ali drove 1/3 of the journey at a speed of 64km/h. Then Betty took over and drove for 20 minutes at a speed of 60km/h. Then Peter took over and drove the remaining 1/4 of the journey. For how many minutes did Peter drive?

This question made use of fractions with speed.

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