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

Correct Answer: 55 mph

50 miles travel in 60 minutes 10 miles travel in ( 60×10)/50 = 12 min Now, 20 - 12 = 8 min In 8 minutes it has to go 10 miles In 1 minutes it has to go 10/8 miles In 60 minutes it has to go ( 10×60)/8 = 75 mph
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#গণিত #Agrani bank Ltd #Agrani bank Ltd - Officer - 12.02.2010 #distance & speed) #দূরত্ব ও গতিবেগ (Time #সময়

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