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A train is going at a speed of 60kmph towards Bangalore from Mumbai and returned back at a speed of 30kmph.
What is its average speed of train?
Answer is 40 km/h.
because for average speed we will use Harmonic mean like
average speed = (2 x 60 x 30) / (60 + 30) = (2 x 60 x 30) / (90) = 40.
If X is the distance between mumbai to banglore
then total time is T=X/60 + X/30=X/20
average speed=(total distance)/(total time taken)=2*X/(X/20)=40km/hr
A coach covers its outward journey at 50 mph.
It returns, over exactly the same distance at 33.3333 mph.
What is the average speed of the coach over the entire journey?
A train 220 m long is running with a speed of 60 kmph. In what time will it pass a man who is running at 6 kmph in the direction opposite to that in which the train is going?
A train overtakes two persons walking along a railway track. The first one walks at 4.5 km/hr. The other one walks at 5.4 km/hr. The train needs 8.4 and 8.5 seconds respectively to overtake them.
What is the speed of the train if both the persons are walking in the same direction as the train?
A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively.
What is the speed of the train?
A train 110 metres long is running with a speed of 60 kmph. In what time will it pass a man who is running at 6 kmph in the direction opposite to that in which the train is going?
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