Question

a car travels a distance of 70 miles in 2 and a half hours. how much faster on the average must it travel to make the trip in 3/4 hours less time? (m.p.h.)

Answer 1

what does "3/4 less time" mean? does it mean in three quarters of the time?

Answer 2

or maybe it means 3/4 of a hour less, so it would be one and three quarters hour

Answer 3

yea i think it means three quarters of the hour

Answer 4

first find the original speed, which is 70 divided by 2.5

Answer 5

i get 28 mph

Answer 6

then find the speed if it takes one and three quarter hours, i.e. divide 70 by 1.75

Answer 7

i get 40 mph
finally find the difference

Answer 8

i got 12