Answers

2014-04-13T07:43:09+05:30
45 + 36 / 2 
= 81/2 
81/2 is the required avg speed
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2014-04-13T09:42:32+05:30
Average speed is sum of speed /2.
speed is 45 km/hr and 36 km/hr .
average speed is (45+36)/2=81/2=40.5km/hr
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