Question

A rocket car on the bonneville salt flats is traveling at a rate of 640 miles per hour. How much time would it take for the car to travel 384 miles at this rate?

Answer 1

d = r t 384 = 640 * t 384/640 = t .6 = t .6 of an hour .6 hr * 60min/1 hr = 36 minutes (just in case it needs to be in minutes)

Answer 2

Answer:

0.6 hour    or      36 minutes

Step-by-step explanation:

We can use proportion to solve this problem.

640 miles =  1 hour

384 miles   =  x

cross-multiply

640 x   =  384

Divide both-side of the equation by 640

$\frac{640x}{640}$  =  $\frac{384}{640}$

(On the left-hand side of the equation 640 at the numerator will cancel-out 640 at the denominator, while on the right-hand side of the equation 384 will be divided by 640)

x  =    $\frac{384}{640}$

x  = 0.6 hour

or

x = 0.6×60 = 36 minutes

Therefore the time it would take the car to travel 384 miles is 0.6 hour  or  36 minutes