Aman moves from a to b with sped 5 km/h for half time and with speed 15 km/h for remaining half time.The average speed of the man over the entire journey is
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Let the Total distance be x
The half distance is covered with 6kmph so the time taken is
6
2
x
=
12
x
The half distance is covered with 3kmph so the time taken is
3
2
x
=
6
x
Avg speed =
Totaltime
Totaldistance
=
6
x
+
12
x
x
12x+6x
72x
18
72
=4
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