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please help

 

 Jun 29, 2020
 #1
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+1

First one    remember    rate x time = distance       or     distance/rate = time

 

45 km / 54 km/hr = .8333333 = 5/6 hr

 

he drove a total of    45 km  + 42 km = 87 km     in   5/6 hr + 35/60 hr

 

87 km /(5/6+ 35/60)hr  = 61.4  km/hr

 Jun 29, 2020
 #2
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no clue

 Jun 29, 2020

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