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Updated on: 13 Mar 2011, 10:01
Originally posted by nafishasan60 on 12 Mar 2011, 23:34.
Last edited by nafishasan60 on 13 Mar 2011, 10:01, edited 1 time in total.
Last edited by nafishasan60 on 13 Mar 2011, 10:01, edited 1 time in total.
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1. Find the time taken by a train 120 meter long, running at 54 km/hr, in crossing an electric pole.
2. A train 160 m long is running at 40 km/hr. In how much time will it pass a platform 140 m long?
3. A train passes a standing man in 2 seconds and a platform 50 m long in 4\(\frac{1}{2}\) seconds. Find the length of the train and its speed.
4. A train 125 m long is running at 50 km/hr. In what time will it pass a man, running at 5 km/hr in the same direction in which the train is going?
5. A train 110 m long is running at 60 km/hr. In what time will it pass a man, running in the direction opposite to that of the train at 6 km/hr?
Solve these five problems. I will post explanations of these problems later.
2. A train 160 m long is running at 40 km/hr. In how much time will it pass a platform 140 m long?
3. A train passes a standing man in 2 seconds and a platform 50 m long in 4\(\frac{1}{2}\) seconds. Find the length of the train and its speed.
4. A train 125 m long is running at 50 km/hr. In what time will it pass a man, running at 5 km/hr in the same direction in which the train is going?
5. A train 110 m long is running at 60 km/hr. In what time will it pass a man, running in the direction opposite to that of the train at 6 km/hr?
Answers:
1. 15 sec.
2. 27 sec.
3. 72 km/hr & length of train 40 m.
4. 10 sec.
5. 6 sec.
1. 15 sec.
2. 27 sec.
3. 72 km/hr & length of train 40 m.
4. 10 sec.
5. 6 sec.
Solve these five problems. I will post explanations of these problems later.
13 Mar 2011, 05:01
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Hi
Please post 1 question per forum.
The answers are like this :
1) Find the time taken by a train 120 meter long, running at 54 km/hr, in crossing an electric pole.
54km/hr = 54 * 1000/60*60 = 54 * 5/18 = 15m/s
120/15 = 8 sec.
Also, the answer to this should be time taken, and not the speed as posted.
2) A train 160 m long is running at 40 km/hr. In how much time will it pass a platform 140 m long?
40 km/hr = 40 * 5/18 = 200/18
Time = (160 + 140)/200/18 = 300/200 * 18 = 27 sec
3) A train passes a standing man in 2 seconds and a platform 50 m long in 4 seconds. Find the length of the train and its speed.
L/s = 2 and L+50/s = 4.5
So 50/S = 2.5 and S = 20 m/s = 72km/hr and L = 40 M
4) A train 125 m long is running at 50 km/hr. In what time will it pass a man, running at 5 km/hr in the same direction in which the train is going?
Relative speed = 50 - 5
125/(45 * 5/18) = (18 * 125)/(45 * 5) = 2250/225 = 10 sec
5) A train 110 m long is running at 60 km/hr. In what time will it pass a man, running in the direction opposite to that of the train at 6 km/hr?
Relative speed = 60 + 6
110/(66 * 5/18) = (18 * 110)/(66 * 5) = 18 * 10/6 * 5 = 3 * 2 = 6
Please post 1 question per forum.
The answers are like this :
1) Find the time taken by a train 120 meter long, running at 54 km/hr, in crossing an electric pole.
54km/hr = 54 * 1000/60*60 = 54 * 5/18 = 15m/s
120/15 = 8 sec.
Also, the answer to this should be time taken, and not the speed as posted.
2) A train 160 m long is running at 40 km/hr. In how much time will it pass a platform 140 m long?
40 km/hr = 40 * 5/18 = 200/18
Time = (160 + 140)/200/18 = 300/200 * 18 = 27 sec
3) A train passes a standing man in 2 seconds and a platform 50 m long in 4 seconds. Find the length of the train and its speed.
L/s = 2 and L+50/s = 4.5
So 50/S = 2.5 and S = 20 m/s = 72km/hr and L = 40 M
4) A train 125 m long is running at 50 km/hr. In what time will it pass a man, running at 5 km/hr in the same direction in which the train is going?
Relative speed = 50 - 5
125/(45 * 5/18) = (18 * 125)/(45 * 5) = 2250/225 = 10 sec
5) A train 110 m long is running at 60 km/hr. In what time will it pass a man, running in the direction opposite to that of the train at 6 km/hr?
Relative speed = 60 + 6
110/(66 * 5/18) = (18 * 110)/(66 * 5) = 18 * 10/6 * 5 = 3 * 2 = 6
13 Mar 2011, 06:08
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Well done Subhash 
Kudos to you!
Kudos to you! 
