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Length of A + B = 410m. Speed_A:Speed_B = 4:7. Time to cross electric pole, A:B = 5:3. Find difference between length of B and A.

1. 8
2. 10
3. 12
4. 14

Correct answer: 10

Solution

Let speed_A=4k, speed_B=7k. Time_A=5t, Time_B=3t. L_A=4k×5t=20kt. L_B=7k×3t=21kt. L_A+L_B=41kt=410 → kt=10. L_A=200m, L_B=210m. Difference=10m.

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