Question

A car cruises at a constant rate of 52 miles per hour. Use front-end estimation to find an approximation of the time taken by the car to cover 620 miles.

A. 10hr
B. 12hr
C. 16hr
D. 20hr

Answer 1

The exact answer is 11.9230769231

that is rounded to B. 12hr

Answer 2

Option B.

Explanation:

It is given that a car cruises at a constant rate of 52 miles per hour. It means

Speed of car = 52 miles per hour

Using front-end estimation, we need find the time taken by the car to cover 620 miles.

In front-end estimation, we approximate the data according to the first digit. So,

Speed of car = 52 miles per hour ≈ 50 miles per hour

Distance = 620 miles ≈ 600 miles

Formula for time:

`Time=(Distance)/(Speed)`

Substitute distance=600 and speed=50 in the above formula.

`Time=(600)/(50)`

`Time=12`

The time taken by the car to cover 620 miles is approximate 12 hr.

Therefore, the correct option is B.