Answers

2016-03-04T07:45:47+05:30
Average speed = ( 60 + 40 )/2 = 100/2 = 50Kmph . So, option (B) is the correct answer.
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2016-03-04T09:55:04+05:30
Let distance be x
total distance is 2x
time for going=x/60
time taken for returning=x/40
total time=(x/60)+(x/40)
=5x/120
avg speed=total dis./ total time
=2x/(5x/120)
=48
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