Question

Man cover a distance of 40 km equal first and kilometre kilometre per second 10 kilometre at 20 km per hour 30 10 kilometre 30 km per hour and last 10 kilometre at 40 km per hour what is the average speed of man

Answer 1

Answer:

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$1st 10km \\ \\ </p><p></p><p>speed=10kmph \\ \\ </p><p></p><p>therefore time=speed/distance=1hr=3600s \\ \\ </p><p></p><p>2nd 10km \\ \\ </p><p></p><p>speed=20kmph \\ \\ </p><p></p><p>time=1/2hr=1800s \\ \\ </p><p></p><p>3rd 10km \\ \\ </p><p></p><p>speed=30kmph \\ \\ </p><p></p><p>time=1/3hr=1200s \\ \\ </p><p></p><p>last 10km \\ \\ </p><p></p><p>speed=40kmph \\ \\ </p><p></p><p>time=1/4hr=900s \\ \\ </p><p></p><p>avg speed=total distance/total time \\ \\ </p><p></p><p>=40000/7500=5.33m/s$

Answer 2

Answer:

1st10km

speed=10kmph

thereforetime=speed/distance=1hr=3600s

2nd10km

speed=20kmph

time=1/2hr=1800s

3rd10km

speed=30kmph

time=1/3hr=1200s

last10km

speed=40kmph

time=1/4hr=900s

avgspeed=totaldistance/totaltime

=40000/7500=5.33m/s