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L = Length of Bridge.
l = length of train

Distance travelled = 90 * 10= 900 mts
1)
L+l = 900; L=5l
6l = 900
l=150 mts

2) Distance travelled in 35 second (4L + l)= 3150 mts

L+l=900
4L+l = 3150
Solving for l. 150 mts

D
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Ansewr is D

1.
Train Size =T
Bridge Size = B = 5T

Time to cross the bridge plus the entire train's last carriage = B+T = 900m =>6T=900 => T=150

2. 
Just the Bridge size and Time will change alongwith the total meters of bridge and train. Therefore, it is also enough.

 
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