When B runs 50 m, then A runs 45 m.
When B runs 1000 m, then A runs (45/50) x 1000 m = 900 m

Correct Option: C

When B runs 50 m, then A runs 45 m.
When B runs 1000 m, then A runs (45/50) x 1000 m = 900 m
∴ B beats A by 100 m.

Time taken by A to cover 400 m = Distance/ Speed
= 400/16 s = 25 s
∴ B covers (400 -16) = 384 m in(25 + 40) = 65 s

Correct Option: D

Time taken by A to cover 400 m = Distance/ Speed
= 400/16 s = 25 s
∴ B covers (400 -16) = 384 m in(25 + 40) = 65 s
∴ B's speed = 384/65 =5.9 m/s

Clearly, Y covers 140 m in 14 s
∴ Y' s time over the course = (14/140) x 1000 = 100 s

Correct Option: A

Clearly, Y covers 140 m in 14 s
∴ Y' s time over the course = (14/140) x 1000 = 100 s
∴ X' s time over the course = 100 - 14 = 86 s

Clearly, B covers 18 m in 9 s.
∴ B's time over the course = 9/18 x 1000 = 500 s

Correct Option: C

Clearly, B covers 18 m in 9 s.
∴ B's time over the course = 9/18 x 1000 = 500 s
∴ A' s time over the course = (500 - 9) = 491 s

Score of A = 100 points
Score of B = 65 points
∴ A can give (100 - 65 ) points

Correct Option: B

Score of A = 100 points
Score of B = 65 points
∴ A can give (100 - 65 ) = 35 points to B.