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  1. A train of length 500 feet crosses a platform of length 700 feet in 10 seconds. The speed of the train is
    1. 70 ft/second
    2. 85 ft/second
    3. 100 ft/second
    4. 120 ft/second
Correct Option: D

Speed of train =
Length of (train + platform)
Time taken to cross

=
500 + 700
feet/second = 120 feet/second
10

Second Method :
Here, x = 500 feet, y = 700 feet
t = 10 seconds, u = ?
using
t =
x + y
u

u =
500 + 700
10

= 120ft/second



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