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Anju

· started a discussion

· 1 Months ago

calculation of equivalent speed (Question: 108789.0 )

how the calculation of equivalent speed done????

Question:

The length of the second train is 25% more than that of the first train and their speeds are 86 km/hr. and 50 km/hr. respectively. They are runing in the same 

direction and the train with higher speed, crosses the train of lower speed in 36 seconds. What is the length of each train?

Options:
A) 160 mtr.,  200 mtr.
B) 100 mtr., 125 mtr.
C) 200 mtr., 250 mtr.
D) 100 mtr., 150 mtr.
Solution:
Ans: (a) Let the length of the first train be ‘l’ meter, then the length of the second train be 1.25 l meter.

Equivalent speed = 36 km/hr = 10 m/sec.

Total length = 2.25 l meter

A.T.Q.,

\(\cfrac{2.25\ l}{10}=36\Rightarrow l=\cfrac{360}{2.25}=160\) meter.

Thus, the length of the second train = 200 meter.

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
Its called relative speed = difference of speed
Keep Learning with Us
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Nitin mikes

· commented

· 1 Months ago

If length is equal not added....

Nitin mikes

· commented

· 1 Months ago

When two objects goes towards same direction speed is deducted and length is added
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