The distance between two cities is ninety miles, and a woman drives from one city to the other at a rate of 45 mph. At what rate must she return if the total travel time is three hours and forty minutes?

27 mph
45 mph
54 mph

Question

The distance between two cities is ninety miles, and a woman drives from one city to the other at a rate of 45 mph. At what rate must she return if the total travel time is three hours and forty minutes?



27 mph
45 mph
54 mph

anonymous · Answer

54

.sam. · Answer

distance = 90 mi ; v = 45 mph ; time = d/v = 2 hrs.
distance = 90 mi ; time = [3 2/3 - 2] = 1 2/3 hrs
v = 90/(5/3) = 54 mph

anonymous · Answer

you can use this formula:
rate = distance/time