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Aptitude - Problems on Trains - Discussion

Discussion Forum : Problems on Trains - General Questions (Q.No. 16)
Problems on Trains
16.
A train travelling at a speed of 75 mph enters a tunnel 31/2 miles long. The train is 1/4 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?
2.5 min
3 min
3.2 min
3.5 min
Answer: Option
Explanation:

Total distance covered
= ( 7 + 1 ( miles
2 4
= 15 miles.
4

Therefore Time taken
= ( 15 ( hrs
4 x 75
= 1 hrs
20
= ( 1 x 60 ( min.
20
= 3 min.

Discussion:
129 comments Page 10 of 13.
Ajit said:   7 years ago
Because 75mph that means 75 miles per hour, not metres.
Hazel said:   5 years ago
Why in this sum we didn't change speed kmph into m/sec?
Nutan said:   7 years ago
7/2 + 1/4 = 15/4 how it comes? Please explain someone.
Karthiga said:   1 decade ago
I can't understand how the total distance calculated.
Abi said:   9 years ago
Why finally it convert into hours? Please explain.
Himaja said:   7 years ago
Can anyone explain about 7/2 how did we get it?
Geemee said:   10 years ago
How can we known that m=mile it can be meter?
Aman said:   1 decade ago
Total distance = 4 miles.

Time = 3.2 mins.
Swetha said:   1 decade ago
I didn't understand? can any one explain ?
Sagar said:   1 decade ago
mph--->meters/hour
Mph---->miles/our
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