A red boat and blue boat are in a race. After 10 minutes,
the blue boat is 500 feet ahead of the red boat. If their
speeds remain constant how many feet is the blue boat
leading the red boat after 3 1/2 hours?
We need to convert 3 1/2 hours into a comparable number
of 10 minute intervals.
3 1/2 hours = 210 minutes
210 minutes / 10 minutes = 21
Because the blue boat gains 500 feet every 10 minutes, we
multiply 500 feet by the number of 10 minute intervals.
500 ft * 21 = 10500 ft