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Jake and Lisa walk a rate of 9 kilometers per hour for 1 1/4 hours [5/4 in improper fraction form] and 6 kilometers per hour for 15 minutes. What is their average speed?

Jake and Lisa walk a rate of 9 kilometers per hour for 1 1/4 hours [5/4 in improper fraction form] and 6 kilometers per hour for 15 minutes. What is their average speed?
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Jake and Lisa walk a rate of 9 kilometers per hour for 1 1/4 hours [5/4 in improper fraction form] and 6 kilometers per hour for 15 minutes. What is their average speed?

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User DethoRhyne
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8.2k points

1 Answer

4 votes
their average speed is (9+6)/(5/4+1/4)=15:6/4=15*4/6=60/6=10 km / h
answered
User Kashish Arora
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8.3k points
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