Sophie and Millie are taking part in a charity run.
They have been training together for the past few weeks and want to cross the finish line together.
The race is a total of 10 miles long.
Sophie sets off at 7:30am and runs at a constant speed of 5mph.
If Millie runs at a constant speed of 10mph, what time should she set off to ensure they finish together?
Speed = distance/time time = distance/speed
First, we can find out how long each of them will take to complete the race.
Sophie: time = 10miles/5mph = 2hrs
Millie: time = 10miles/10mph = 1hr
Therefore, Millie should leave at 8.30am