Sophie bikes s miles per hour. Her friend Rana is slower. Rana bikes r miles per hour. Yesterday, Sophie biked for t hours. How many miles was Sophie's route?

Answer 1

Sophie's distance = speed x time

Sophie biked s miles per hour for t hours, so her distance is:

distance = s x t

Rana's speed is r miles per hour, but we don't know how long she biked for, so we can't calculate her distance.

Therefore, Sophie's route was s x t miles long.