a man walks on a straight road from his home to a market 2.5km away with a speed of 5km/h. finding the market closed ,he instantly turns and walks back home with spped of 7.5km/h . the average speed of man over the interval of time 0 to 40 min is equal to:
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t1= 2.5 km/ 5kmhr= 30 min
t2= 2.5/7.5= 20min
Total time= 30+20=50min
In time 0- 40min
Speed= 7.5km/hr ( since he would be returning at that time)
Distance= 2.5 km ( already given
Now, net distance= speed x time= 7.5x10/60= 1.25
Total distance= 2.5+1.25=3.75
Avg speed = total distance / total time= 3.75/40/60= 5.625km
I hope it helps you
Thanks..
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