John takes 10 hours for his trip. For the first five hours his average speed was 40mph. For the next five hours his average speed was 50mph. What was John's average speed during his journey?
a)35mph
b)45mph
c)40mph
d)25mph
e)30mph

• 
  45 mph
  
  Total distance travelled = 40*5 +50*5 = 450 miles
  time taken = 10 hrs
  average speed = 450/10 = 45 mph .... option b)
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