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Lun

· started a discussion

· 1 Months ago

Please explain from the last 3rd line (Question: 388239.0 )

Please explain from the last 3rd line

Question:

The Delhi-Jaipur Express train can move at 45 kmph without its wagons and the speed is diminished by a constant rate that varies as the square root of the number of wagons attached. If speed of trains is 30 kmph with 9 wagons, what is the maximum number  of wagons that can be attached to move train ?

Options:
A)

63

B)

64

C)

80

D)

81

Solution:

Ans: (c)

  

Jaison

· commented

· 1 Months ago

0=45-5\/w
W=81.
But at this much wagons... train stops. So 1 wagon is removed.

Vikas

· commented

· 1 Months ago

If we attach 81 wagons. The spped will become 0 that means the train won't move at all hence, in order to move the train we need to remove one wagon. Hope that explians.
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