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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 2 minutes at hyperturbo speed and 18 minutes at turbo speed, how much longer can the car run at normal speed, assuming it started with a fully charged battery?

 Feb 11, 2021
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2 min at hyper-turbo is   2 out of 20 battery usage    = 1/10 used

18 minutes at turbo   is  18 out of 40 battery usage =  9/20  used

 

1/10 + 9/20 = 11/20 used     soooo   9/20 remains

 

9/20 x 60 minutes normal speed = 27 minutes runtime at normal

 Feb 11, 2021

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