In order to calculate the amount of time do you cool down we would have to make the following calculation:
time to cool down = distance / rate
According to the given data we have the following:
distance=the total distance you bike is 35 miles
rate=0.25 miles/minute
Therefore, time to cool down =35 miles / 0.25 miles / minute
time to cool down =140 minutes
Therefore, he would need to cool down for 140 minutes