6. A man covers a total distance of 100 km on bicycle. For the first 2 hours, the speed was 20 km/hr and for the rest of the journey, it came down to 10 km/hr. The average speed will be
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Total distance=100
in the first part of the journey,
time=2hr
speed=20km/hr
distance=speed*time
=20*2
=40km
In the rest of the journey
speed=10km/hr
Distance= 100-40
=60km
time=Distance÷speed
=60÷10
=6hr
Therefore,
Av. speed=total distance÷total
time
=100÷6+2
=100÷8
=12.5km/hr
Hope it is helpful!!
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