Jessica is delighted at her new purchase of remote control car. She looks at the box it came in, and reads that it is 'guaranteed to travel 10km on a single battery'. Jessica puts her car on a specially designed 1-meter radius circular track, for exercise, and then leaves for the night. The car starts moving, completing one lap every twenty seconds!
Three hours after Jessica leaves, her little sister Gabrielle arrives and sees the new toy. Shrieking with excitement Gabrielle shouts 'faster, go on, faster'. The car complies and starts going five times its original speed, zooming around the track again and again.
How many minutes in total did it take for the Wheelie Bot to run out of batteries?? (round your answer down to the nearest minute)
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