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 5 of 10.
Mahe said:
1 decade ago
@Faisel,
If they meet 8am then
Distance covered by b in xhrs is 25x
Distance covered by a in(X+1)HRS=20(X+1)
(x+1) coz v r considering 1 hr aft train A has started..
So,
25X+20(X+1)=110
45X=90
X=2
Hence 8am + 2 = 10am
If they meet 8am then
Distance covered by b in xhrs is 25x
Distance covered by a in(X+1)HRS=20(X+1)
(x+1) coz v r considering 1 hr aft train A has started..
So,
25X+20(X+1)=110
45X=90
X=2
Hence 8am + 2 = 10am
Chai said:
1 decade ago
A and B are two stations 390 km a part. A train start from A at 10 AM and travels towards B at 65 kmph. Another train start from B at 11 AM and travels towards A at 35 kmph. At what time do they meet? Solve this problem.
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?
Chings said:
6 years ago
2 station A and B are 110km apart.
1 train start from A at 7 am towards B at 20 kmph 110-20 = 90.
Next one start from B at 8 a.m towards A at 25kmph.
20+25 =45.
Now 90/45 = 2hrs.
.`. 8+2 = 10 a.m.
1 train start from A at 7 am towards B at 20 kmph 110-20 = 90.
Next one start from B at 8 a.m towards A at 25kmph.
20+25 =45.
Now 90/45 = 2hrs.
.`. 8+2 = 10 a.m.
(2)
Faisal said:
1 decade ago
what if we say they meet after 8AM
Distance covered by B in x Hrs =25X
Distance covered by A in (x-1)Hrs = 20(x-1)
25x+20(x-1)=110
25x+20x-20=110
25x+20x=130
45x=130
x= 2.8 ( Which in incorrect how come )
Distance covered by B in x Hrs =25X
Distance covered by A in (x-1)Hrs = 20(x-1)
25x+20(x-1)=110
25x+20x-20=110
25x+20x=130
45x=130
x= 2.8 ( Which in incorrect how come )
Likhit D Naik said:
5 years ago
Hey @Syed.
x-1 is used because the second train starts one hour after the first train.
When X=3 is the time in hours to meet. The starting time is 7 a.m so add 3 to it is 10 a.m when the trains meet.
x-1 is used because the second train starts one hour after the first train.
When X=3 is the time in hours to meet. The starting time is 7 a.m so add 3 to it is 10 a.m when the trains meet.
(2)
Damodar Narayan said:
1 decade ago
A----------110---------B 7am
A---------90--------B 8am(Speed of the 1st train is 20 km/h)
A----45----B 9am(relative speed=20+25(45) km/h)
AB 10am
A---------90--------B 8am(Speed of the 1st train is 20 km/h)
A----45----B 9am(relative speed=20+25(45) km/h)
AB 10am
R v said:
1 decade ago
One train will cover 20 km in one hour.
Now the distance remaining is 90 km.
So time take is equal to 90/20+25 = 2 hours means will meet 2 hours after 8 am i.e. 10 am.
Now the distance remaining is 90 km.
So time take is equal to 90/20+25 = 2 hours means will meet 2 hours after 8 am i.e. 10 am.
Hardik khatri said:
10 years ago
@Chai.
Why do we have to take the distance 390 when we add this covered by A after x hours and this covered by B after x-1 hours then why we equal it to 390 km?
Why do we have to take the distance 390 when we add this covered by A after x hours and this covered by B after x-1 hours then why we equal it to 390 km?
Nayana said:
1 decade ago
@Randhir
In the problem what you have solved above,the distance between point A and B is 6Y. I am not getting how you got 6Y. Can you please explain me that?
In the problem what you have solved above,the distance between point A and B is 6Y. I am not getting how you got 6Y. Can you please explain me that?
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