Question

It took Terry 7h to drive 390km from Cold Bay to Morgan's Cove. He averaged 60km/h for the first part of the trip but was forced to drive at 50km/h due to the thunderstorm. How many hours did he spend driving at 50km/h?

Option 1: 3 hours
Option 2: 2 hours
Option 3: 4 hours
Option 4: 5 hours

Answer 1

Terry spent 3 hours driving at 50km/h during his trip from Cold Bay to Morgan's Cove. This was calculated by setting up an equation based on the total distance and time of the trip and the speeds at which he drove.

Step-by-step explanation:

To determine how many hours Terry spent driving at 50km/h, we can use the formula speed equals distance divided by time. The total trip was 390km, and it took Terry 7 hours. If we let t be the time Terry drove at 60km/h, then the distance he covered at this speed would be 60km/h multiplied by t. For the rest of the trip, which is 7 - t hours, he drove at 50km/h. The distance covered at 50km/h would then be 50km/h multiplied by 7 - t. The sum of these two distances should equal 390km.

Now we can set up the equation:
60t + 50(7 - t) = 390.
Solving for t gives:
60t + 350 - 50t = 390
10t = 40
t = 4 hours.

Thus, Terry drove for 4 hours at 60km/h, leaving 7 - 4 = 3 hours driving at 50km/h.