the winner of a 400 mile car race drove at a rate of 138.772 mph. what was the winner's time?

Question

Rounding to the nearest thousandth.

Answer 1

2.882 hours

 

I took 400 miles/ 138.722mph and I 2.882 hours, base on the formula d/r=t

Answer 2

Let v = speed or rate

Let d = distance

Let t = time

 

d = 400 miles

v = 138.772 miles per hour

 

We need to find t.

 

If v = d/t  ,  then t = d/v

 

t = (400 miles) / (138.772 miles per hour)

 

t = 2.882 hours