Question

A car that travels 20 miles in \frac{1}{2} 2 1 ​ hour at constant speed is traveling at the same speed as a car that travels 30 miles in \frac{3}{4} 4 3 ​ hour at a constant speed.

Answer 1

Explanation:

If distance is 20 miles and time is (1/2) h. Its speed is given by :

`v=(d)/(t)\\\\v=(20\ miles)/(1/2\ h)\\\\v=40\ mph`

If the distance is 30 miles and the time is (3/4) hours. Its speed is given by :

`v=(d)/(t)\\\\v=(30\ miles)/(3/4\ h)\\\\v=40\ mph`

So, the rate or the speed ib both the case is constant.