Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 16)
16.
A train travelling at a speed of 75 mph enters a tunnel 3
miles long. The train is 
mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?
miles long. The train is mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?Answer: Option
Explanation:
| Total distance covered |
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 Time taken |
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| = 3 min. |
Discussion:
129 comments Page 6 of 13.
Subhankar said:
1 decade ago
Here the speed given in metre/hr and distance given in mile then how it possible to evaluate time without converting length in same unit.
Kolli Hemanth said:
2 years ago
@All.
Here mph means meters per hour but the distance is given in miles. So, miles must be converted into meters. 1 mile=1609 meters.
Here mph means meters per hour but the distance is given in miles. So, miles must be converted into meters. 1 mile=1609 meters.
(15)
Nitish Vajpayee said:
1 decade ago
Speed is given in meter/hr.
How come its taken with distance in miles and calculated (15/4)/75? How that possible different units?
How come its taken with distance in miles and calculated (15/4)/75? How that possible different units?
Varinder said:
8 years ago
The total distance should be 7/2(tunnel)+1/4(while front entering in the tunnel)+1/4(while the rear is out of the tunnel) = 4 miles.
Abhi said:
7 years ago
Here, it is asked for the time the front enters the rare emerges. So we will have to Add 1/4 more to the length of the Train Right.
Suriya said:
8 months ago
@All.
Just add the distance, simply using the time formula. You get 0.05 hours just multiply 60 to get minutes. The answer is 3.
Just add the distance, simply using the time formula. You get 0.05 hours just multiply 60 to get minutes. The answer is 3.
(1)
Tushar V. Ladukar said:
8 years ago
In the question as length of the tunnel is mentioned 3 miles and length of train 1 miles, how 7/2 and 1/4 is taken respectively?
Manju Gangadhar said:
7 years ago
75mph.
Where mph is miles per hour. Then only the answer is correct. If it is meters per hour then the given answer is wrong.
Where mph is miles per hour. Then only the answer is correct. If it is meters per hour then the given answer is wrong.
Shubhendu said:
10 years ago
Question itself says, time from front of train enters to rear emerges.
So distance traveled should be 7/2 + 1/4 + 1/4 = 4.
So distance traveled should be 7/2 + 1/4 + 1/4 = 4.
Swetha said:
1 decade ago
Why don't we convert miles into meter in this problem? I'm very confused. Can anyone explain the solution clearly? please.
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