As part of her training routine for​ basketball, Shaylle alternates between cycling and running for exercise. She cycles at a rate of 10 mph and runs at a rate of 6 mph. If she spends 2.5 hours exercising and covers a total of 21 miles, how much time did she spend on each​ exercise?

1 answer

time spent cyling --- x hrs
times spent running --- (2.5 - x) hrs
10x + 6(2.5-x) = 21

carry on