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?
Solution
Correct Answer: Option E
50 mile goes in 60 min 1 mile goes in 60/50min 10 mile goes in 60X50/10=12min time remaining=20-12=8 min in 8 minitue goes 10 mile in 1 minitue goes 10/8 mile in 60 minitue goes 10x60/8 mile=75 mile
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