Question

How long will it take to drive 30 miles going 15 mph?

Answer 1

It will take two hours to drive 30 miles.

mph= Miles per hour
The first hour you're going 15 miles, then another hour later you're at 30 miles.

Two hours.

Answer 2

distance=speed times time

distance=30mi
speed=15mph
t=t


so
30=15 times t
divide both sides by 15
2=t

2 hours