Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 30)
30.
Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph. At what time will they meet?
Answer: Option
Explanation:
Suppose they meet x hours after 7 a.m.
Distance covered by A in x hours = 20x km.
Distance covered by B in (x - 1) hours = 25(x - 1) km.
20x + 25(x - 1) = 110
45x = 135
x = 3.
So, they meet at 10 a.m.
Discussion:
92 comments Page 2 of 10.
Manisha said:
7 years ago
A train travels in one houe=20 km.
Now at 8 o'clock distance between tow trains = 90 km.
It is relavent to these two trains speed =20+25km/h = 45km/h.
Now time = distance/speed.
= 90/45 = 2h.
Hence trains meet after 2hours that is 8+2 = 10 a.m.
Now at 8 o'clock distance between tow trains = 90 km.
It is relavent to these two trains speed =20+25km/h = 45km/h.
Now time = distance/speed.
= 90/45 = 2h.
Hence trains meet after 2hours that is 8+2 = 10 a.m.
(1)
Mano said:
6 years ago
How we are obtained the 10 ?
Please explain it.
Please explain it.
(1)
Syed Abdul Raqeeb said:
5 years ago
Why x-1 is used in this sum, and how x=3 and how the answer is 10? Please explain.
(1)
Gokul Ramakrishnan said:
4 years ago
@Chai.
I got 2.25 is it correct or not?
I got 2.25 is it correct or not?
(1)
Sonic said:
9 years ago
Why it's taken x-1 but not x+1 because train 2 starts 1 hr later?
Anna said:
7 years ago
Thank you very much @Yuvaraj.
Ayush said:
9 years ago
60 km as relative speed of both the trains is 100 km/hr and
distance = 100km.
Then time taken to meet = distance/speed(relative).
T = 100/100 = 1 hr
So the trains will meet each other after 1 hour so,
Distance covered by first train in 1 hour = 60km/hr * 1hr = 60 km,
Distance covered by second train in 1 hour = 40km/hr * 1hr = 40 km,
Therefore, the distance from station A where both trains will meet = 60km.
distance = 100km.
Then time taken to meet = distance/speed(relative).
T = 100/100 = 1 hr
So the trains will meet each other after 1 hour so,
Distance covered by first train in 1 hour = 60km/hr * 1hr = 60 km,
Distance covered by second train in 1 hour = 40km/hr * 1hr = 40 km,
Therefore, the distance from station A where both trains will meet = 60km.
Ankita said:
9 years ago
Distance between two stations A and B is 100 km, two trains with speed 60 km/h and 40 km/h are running towards each other. What is the distance from station A where both trains will meet?
Can anyone find the answer?
Can anyone find the answer?
Sourav Pal said:
9 years ago
Simple formula to be remembered.
Total Time Taken = (d = s2 * t)/s1 + s2.
Where d = 110km, s2 = 25kmph, s1 = 20kmph, t = (8:00am - 7:00am) = 1hr.
From that we get 3hrs.
Therefore required Time is (7:00am + 3hrs) = 10:00Am.
Total Time Taken = (d = s2 * t)/s1 + s2.
Where d = 110km, s2 = 25kmph, s1 = 20kmph, t = (8:00am - 7:00am) = 1hr.
From that we get 3hrs.
Therefore required Time is (7:00am + 3hrs) = 10:00Am.
Rabiul said:
9 years ago
Thanks @Manish Dabhi.
Your explanation is very useful.
Your explanation is very useful.
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