a train covers its half journey by 30 kilometre per second and the other half by 40 km per second calculate the average speed of the train of the whole journey???
plz explane
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Average speed=total distance/total time
d=distance travelled at 30m/s and distance travelled at 40m/s … same distance
time=distance/speed
time at 30m/s =d/30
time at 40 m/s=d/40
total time=d/30 + d/40= 7d/120
average speed= (d+d)/(7d/120)= 240/7=34.2857 m/s
It is not the average of the speeds because he spends more time at 30 m/s then at 40 m/s
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