a train covers half of its journey at a speed of 30m/s and other half with a speed of 40 meters per second calculate its average speed of entire journey
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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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