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A remote control car can run for one hour at normal speed, 40 minutes at turbo speed, and 20 minutes at hyperturbo speed before its battery life is consumed. After running for 4 minutes at hyperturbo speed and 16 minutes at turbo speed, how much longer can the car run at normal speed, assuming it started with a fully charged battery?

 Aug 17, 2020
 #1
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Start fully charged  100 %

 

run hyper  4/20   consumed   leaves   16/20      16/20 x 100% = 80 % left

 

run turbo  16/40    leaves  24/40 of remaining battery      24/40 x 80% = 48% battery left

Normal speed runs for one hour with 100%   but only 48% of an hour of battery is left    48% x 60 minutes = 28.8 minutes

 Aug 17, 2020

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