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.
Neha said:
1 decade ago
Why we not convert 75 kmph to m/sec?
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?
Sudarsan said:
1 decade ago
Can any body explain, in the particular question my doubt is length is miles per hour and also unit of speed is also given in miles. Whether the length-speed or length-time is to be same unit of measurement to calculate the third?
I was thinking length-time-speed should be either Kilometer-hour-Kph or meter-seconds-meter per second.
I was thinking length-time-speed should be either Kilometer-hour-Kph or meter-seconds-meter per second.
Anjali said:
10 years ago
How did you know that the time found was in terms of hours?
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.
Geemee said:
10 years ago
How can we known that m=mile it can be meter?
Anurag said:
10 years ago
@Geemee.
It already mentioned m=mile.
It already mentioned m=mile.
Vishu said:
10 years ago
Time = Distance/Speed.
Time = (15/4)/75.
So how will it come like this 15/4*75?
Time = (15/4)/75.
So how will it come like this 15/4*75?
Poonam goyal said:
9 years ago
Why you not change the miles into a meter?
Anup said:
9 years ago
Let me try to make this clear in 2 points.
#1. This question is same as train crossing the platform
#2. If we keep on reducing the size of tunnel till it reaches to size zero,i.e., the tunnel has now become a point so now we will calculate the time by using the length of the train only once. now when the size of the tunnel is added we can calculate time by Length of the train + Length of the tunnel / speed of the train.
#1. This question is same as train crossing the platform
#2. If we keep on reducing the size of tunnel till it reaches to size zero,i.e., the tunnel has now become a point so now we will calculate the time by using the length of the train only once. now when the size of the tunnel is added we can calculate time by Length of the train + Length of the tunnel / speed of the train.
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