Question

Which expression calculates the time in hours an object takes to travel 38 miles at a speed of 2 m/h ?

A. 38·2
B. 38/2
C. 38-2
D. 38+2

How long would it take to travel 198 km at the rate of 36 km/h ?
A. 5.5h
B. 162h
C. 234h
D. 7128h

Answer 1

B

A

Explanation:

Answer 2

B. 38/2

A. 5.5h

Explanation:

For the first question we use the formula for velocity:

`v=(d)/(t)`

where
`d` is the distance and
`t` is time, and we clear for time:

`t=(d)/(v)`

thus, if the object travels a distance of 38 miles, at a velocity of 2m/h, the time it takes is:

`t=(38)/(2)`

which is option B.

For the second question we do the same, the difference is that now we have a distance of 198km at a velocity of 36km/h, the time must be:

`t=(198km)/(36km/h)=5.5h`

the time is 5.5 hours which is option A.