Question

The cost of having a car for a journey of 420 km is given by the formula c=50+ 20t. Find the cost of hiring the car for a journey of 420 km.

a) 50
b) 75
c) 100
d) 120

Answer 1

To find the cost of hiring the car for a journey of 420 km, substitute the time taken into the given formula c = 50 + 20t. The cost of hiring the car for a journey of 420 km is $470.

Step-by-step explanation:

To find the cost of hiring the car for a journey of 420 km, we need to substitute the value of t (the time taken for the journey) into the formula c = 50 + 20t.

Since the distance of the journey is 420 km, we can assume that t is the time taken in hours. Thus, t = 420/20 = 21.

Substituting t = 21 into the formula, we get c = 50 + 20(21) = 50 + 420 = 470.

Therefore, the cost of hiring the car for a journey of 420 km is $470.