oscar drove 240 miles in 4 hours. How far will he drive in 7 hours

Answer 1

If he drove 240 miles in 4 hours, Oscar would have driven 60 miles in 1 hour.

Therefore, the ratio is

1/60=7/x, x being the number of miles Oscar would have driven in 7 hours (your unknown).

Cross multiply and you get x=420.

He drove 420 miles in 7 hrs.

Answer 2

240 miles in 4 hours means 60 miles in one hour; therefore in 7 hrs he will drive 420 miles.