Question 1012455
 It took dave 8 hours to drive from his apartment to the museum at a speed of 90 km/h. If he takes 10 hours to make the return trip home, what will his speed be? 
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distance from apt. to museum:: 90*8 = 720 km
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Ans: return rate = 720/10 = 72 km/hr
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Cheers,
Stan H