+16 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?
+37159 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
