Q.

If n is length of a rail in metres, the number of sleepers per rail length generally varies from

A. n to (n + 2)
B. (n + 2) to (n + 4)
C. (n + 3) to (n + 6)
D. (n + 4) to (n + 5)
Answer» C. (n + 3) to (n + 6)
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