An emergency vehicle travels 10 miles at a speed of 50 miles per hour. how fast must the vehicle travel on the return trip if the round trip travel time is 20 minutes?

A 55 mph

B 60 mph

C 65 mph

D 70 mph

E 75 mph

Correct Answer: Option E

50 miles travel in 60 minutes

So, 10 " " (60×10)/50 = 12 min.

Now, 20-12=8 min.

So, In 8 minutes it has to go 10 miles

So, " 1 " " " 10/8 "

So, " 60 " " " = (10×60)/8 " = 75 mph