Poor RobotMath brain teasers require computations to solve.
Jilbert is delighted at her new purchase of a Wheelie Bot (robot). She looks at the box it came in, and reads that it is 'guaranteed to travel 10km on a single battery'. Wow, what a long way! Jilbert puts her Wheelie Bot on a specially designed 1-meter radius circular track, for exercise, and then leaves for the night. The Wheelie Bot starts moving, completing one lap every twenty seconds!
Three hours after Jilbert leaves, her little sister Harriet arrives and sees the new toy. Shrieking with excitement Harriet shouts 'faster, go on, faster'. The Wheelie Bot complies and starts going five times its original speed, zooming around the track again and again - poor Wheelie Bot :( When Jilbert got back and saw her poor Wheelie Bot exhausted she was not a happy sister!
The question is :
How many minutes in total did it take for the Wheelie Bot to run out of batteries?? (please round your answer down to the nearest minute)
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