SOLUTION: A bus passenger observes that a train moving in opposite direction passes him in 5 seconds; but moving in the same direction with him, it passes him in 45 seconds. Compare the spee
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Question 906585: A bus passenger observes that a train moving in opposite direction passes him in 5 seconds; but moving in the same direction with him, it passes him in 45 seconds. Compare the speed of the bus with that of the train.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
In opposite directions, add the speeds
The combined speeds are inversely proportional
to the time it takes to pass
(1)
-------------------------
In the same direction, subtract the speeds:
Let s[2] be the speed of the train, which is faster
(2)
--------------------------
Add the equations:
--------------------
and
(1)
(1)
(1)
(1)
-----------------------
( speed of bus ) / ( speed of train ) =
The bus's speed is 4/5 of the trains speed
-------------------
Hope I got it
You might want a 2nd opinion, too
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