Question

A bicyclist is riding at 15 miles per hour toward a campsite that is 135 miles away. The function d = 135 – 15t represents the distance d from the campsite the bicyclist is t hours after he has started riding. When will the bicyclist reach the campsite?

(A) 6 hours
(B) 7 hours
(C) 8 hours
(D) 9 hours

Answer 1

The bicyclist will reach the campsite in 9 hours.

Step-by-step explanation:

To find out when the bicyclist will reach the campsite, we need to set the distance formula equal to zero and solve for t:

135 - 15t = 0

Subtracting 135 from both sides gives:

-15t = -135

Dividing both sides by -15 gives:

t = 9

So the bicyclist will reach the campsite in 9 hour.