Problema Solution
juan drove to his girlfriend's house in 2 hours and averaged 100km/h if it took him 3 hours to return home, what was his average speed on the return trip?
Answer provided by our tutors
Let 'S' be the distance from Juan's house to his girlfriend's house - the distance that Juan drove.
The formula for average speed v = S / t where S is the distance and t is the time needed to pass that distance.
He needed 2 hours and speed of 100 km/h to pass the distance S: S = 100 * 2 = 200 km
It took him 3 hours to make the same distance of 200 km back.
By the formula for average speed v = S / t we have
v = 200 / 3
v = 66. 67 km/h approximately
The average speed on the return trip is 66. 67 km/h approximately.