Problema Solution
two friends jog from their apartment down to the beach at an average speed of 6 miles per hour . they jog back at an average speed of 4 miles per hour. what was the average speed for the entire trip
Answer provided by our tutors
Let time taken be t1 and t2 and the distance travelled one way be d
hence we know that average speed = 2d /(t1 + t2)
now we also know that,
t1 = d/6 and t2 = d/4
hence we get,
average speed = 2d /(d/6 + d/4)
= 2/(10/24)
= 2*24/10
= 4.8 miles per hr.