Question

Rene is going to the lake to visit some friends. If the lake is 60 miles away, and Rene is driving at 40 miles per hour the entire time, how long will it take her to get to the lake?*

- 50 minutes
- 70 minutes
- 90 minutes
- 110 minutes

Answer 1

It will take 90 minutes.
Why?
Rene has to go 60 miles.
He takes 1 hour to go 40 miles.
60 miles is 'one and a half' times 40.
So, he needs an hour and a half to go 60 miles.

Answer 2

It would be 90 minutes, but you can figure this out by doing a fraction:

40 miles/ 60 minutes = 60 miles / x

If you cross multiply, you do 60 times 60 and 40 times x.

3,600 = 40x

You now need to divide by 40 on each side so that you can find the value for x.

3,600/40 = 90 = x