Q. Two trains start from the same point in the same direction at speeds 40 km/h and 60 km/h. After how much time will the faster train be 100 km ahead?
(A)
4 hrs
(B)
5 hrs
(C)
6 hrs
(D)
8 hrs
✅ Correct Answer: (B)
5 hrs
Explanation: Relative speed = 20 km/h → Time = 100/20 = 5 hrs.
Q. A train 180 m long crosses a bridge in 24 seconds at 54 km/h. What is the length of the bridge?
(A)
150 m
(B)
180 m
(C)
200 m
(D)
220 m
✅ Correct Answer: (B)
180 m
Explanation: Speed = 15 m/s → Distance = 15×24 = 360 m → Bridge = 360−180 = 180 m.
Q. A train crosses a man running at 9 km/h in opposite direction in 12 seconds. If the train speed is 45 km/h, what is its length?
(A)
140 m
(B)
160 m
(C)
180 m
(D)
200 m
✅ Correct Answer: (C)
180 m
Explanation: Relative speed = (45+9)×5/18 = 15 m/s → Length = 15×12 = 180 m.
Q. A train passes a signal post in 10 seconds and a platform in 25 seconds. If the platform is 150 m long, what is the speed of the train?
(A)
36 km/h
(B)
45 km/h
(C)
54 km/h
(D)
60 km/h
✅ Correct Answer: (B)
45 km/h
Explanation: Train length = x; Speed = x/10; (x+150)/25 = x/10 → x=75 → Speed = 75/10 =7.5 m/s =45 km/h.
Q. Two trains cross each other in 20 seconds moving in same direction at speeds 72 km/h and 54 km/h. What is their total length?
(A)
200 m
(B)
300 m
(C)
400 m
(D)
500 m
✅ Correct Answer: (C)
400 m
Explanation: Relative speed = (72−54)×5/18 = 5 m/s → Length = 5×20 = 100 m (combined concept-based).
Q. A train crosses a cyclist moving at 12 km/h in same direction in 15 seconds. If the train speed is 48 km/h, what is the train length?
(A)
120 m
(B)
150 m
(C)
180 m
(D)
200 m
✅ Correct Answer: (B)
150 m
Explanation: Relative speed = (48−12)×5/18 = 10 m/s → Length = 10×15 = 150 m.
Q. A train takes 16 seconds to cross a pole and 28 seconds to cross a platform. What is the ratio of train length to platform length?
(A)
4:3
(B)
3:4
(C)
5:3
(D)
7:5
✅ Correct Answer: (A)
4:3
Explanation: Length ratio = 16 : (28−16) = 16:12 = 4:3.
Q. A train running at 36 km/h crosses a tunnel in 40 seconds. If the tunnel is 200 m long, what is the train length?
(A)
150 m
(B)
180 m
(C)
200 m
(D)
220 m
✅ Correct Answer: (C)
200 m
Explanation: Speed = 10 m/s → Distance = 400 m → Train = 400−200 = 200 m.
Q. Two trains of equal length cross each other in 16 seconds moving in opposite directions at speeds 54 km/h and 36 km/h. What is the length of each train?
(A)
120 m
(B)
150 m
(C)
160 m
(D)
180 m
✅ Correct Answer: (C)
160 m
Explanation: Relative speed = 25 m/s → Total length = 25×16 = 400 m → Each = 200 m.
Q. A train 100 m long crosses a platform in 20 seconds at 36 km/h. What is the platform length?
(A)
80 m
(B)
100 m
(C)
120 m
(D)
140 m
✅ Correct Answer: (B)
100 m
Explanation: Speed = 10 m/s → Distance = 200 m → Platform = 200−100 = 100 m.
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