Last week I travelled from London to Leeds, which is a distance of 174 miles. I started at 9.15am and completed the journey with an average speed of 40 miles per hour. On the way back, in the evening, I travelled exactly the same route, starting at 5.15pm. The traffic was light and I completed the journey with an average speed of 60 miles per hour. What was the overall average speed for round trip? The answer is not 50 mph.

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Answers

2015-10-06T13:48:29+05:30
Outward journey took 174 miles /40 m/h=4.35 hours
return journey took  174 miles/6m/h=2.9 hours
total distance =2*174=348 miles
total time=4.35+2.9 hours=7.25 hours
therefore average speed=348miles/7.25sec=48 miles per hour
i hope this helps u...
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