Problema Solution
it took joe 7 hours to drive to a football game. On the way home he was able to increase his speed by 18 mph and make the return drive 5 hours. find his average speed on the return drive
Answer provided by our tutors
let
v = the average speed when driving to the football game
v + 18 = the average speed when driving back
we will use the formula average speed = distance/time => distance = avg.speed*time
since the distance back and forth is the same we can write
7*v = 5(v + 18)
by solving we find
v = 45 mph
click here to see the step by step solution of the equation
v + 18 = 45 + 18 = 63 mph
the average speed on the return drive is 63 mph.