Problema Solution
It took 1.8 hours to get to texas on friday. Saturday night it took 2 hours to return. The average speed on Friday was 4 mph slower on friday. What was the average speed on saturday?
Answer provided by our tutors
distance = speed * time
we interpret "The average speed on Friday was 4 mph slower on friday." to mean "The average speed on Saturday was 4 mph slower than it was on Friday."
let 'v' represent the speed on Saturday, then 'v+4' represents the speed on Friday
the same distance is driven, the we set the speed*time expressions equal to each other:
(v+4)1.8 = 2v
solving for 'v' we have v=36
the average speed on Saturday was 36 mph