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  • 5 years ago

John drives his car from P to Q at an average speed of 90 km/h for 3 hours 30 minutes. She returns from P to Q by taking 1/2 hour longer than the time taken from P to Q. Calculate the average speed, in km/h, for the whole journey

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  1. anonymous
    • 5 years ago
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    well it's 84km/h to go from P to Q then to come back

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