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Mathematics: Post your doubts here!

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Please I need an immediate reply! :(
 
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The length of a train is 120m travelling at a speed of 144km/hr passes a bridge of length 20m, calculate the time taken by the train to pass the bridge. (3)
shoaib672002
Awesome12


NEED HELP FAST
A good question
Convert the speed in to m/s which is 40 m/s
Now it will cover 20 m in half a second. The train is 120 m. So we divide 120/20 = 6
The time taken for the entire train to pass the bridge is 6 * 0.5 = 3s
 
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guys im stuck in a qsnt !! paper 0580/22/oct-nov/2011 !! .. in qsnt 10 !! the sum is 3/x+10 - 1/x+4 !! ... 3 and 1 is in the numerator and X+10 and X+4 is in denominator !! ... they r saying write as a single fraction in its simplest form . HELP PLZZ !!
 
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