Question

A car travelling at a constant speed takes 50 seconds longer to travel a distance of 5 miles than it would take to travel at 72 miles per hour. What is the speed of the car ?​

Answer 1

The original speed of the car will be 60 mph.

Step-by-step explanation:

Moving at a speed of 72 mph the car will cover a distance of 5 miles in $\frac{5}{72} \times 60 = 4.17$ minutes i.e. 250 seconds.

Now, given that a car traveling at a constant speed takes 50 seconds longer to travel a distance of 5 miles than it would take to travel at 72 miles per hour.

So, at the original speed, the car moves by 5 miles in (250 + 50) = 300 seconds.

Hence, the original speed of the car will be $\frac{5}{300} \times 3600 = 60$ mph. (Answer)