A man covers 18 km in 3 hrs and next 21 km in 3 and half hour. Find his average
speed
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Answer:Let the time he walks be x hours
From the given condition
3(x)+9(3−x)=15⟹6x=12⟹x=2
So the time he runs is 3−2=1 hour
Distance covered by running is 1×9=9 km
Step-by-step explanation:
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