justin walked 300 meters in 2 minutes, stopped to talk to a friend for 3 minutes, continued walking another 500 meters in 3 minutes. what his average speed?
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Explanation:
We know that:
Speed in first half of journey = Distance/Time
= 300m/60×2 sec
= 300/120
= 5/2
= 2.5m/s
Speed in second half of journey = Distance/Time
= 500m/60×3sec
= 500/180
= 4.16m/s
Therefore,now:
Average Speed = Final speed + Initial Speed / 2
= 2.5+4.16/2
= 6.66/2
= 3.33 m/s
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