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 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 9 of 13.

Kishan Maurya said:   4 years ago
Length of train will be 2 times of 1/4.
And correct ansr is 3.2min.
(6)

Mahedi bipul said:   6 years ago
mph means mile per hour or metres per hour?

Which one is correct?

Sathish said:   9 years ago
Why this problem isn't convert the miles to meters or K.meters?

Shalinwilson said:   7 years ago
3.75 miles.
3.75/75=.05,
.05 * 60 = 30min,

miles = meters.

Viswam said:   1 decade ago
See this link: http://www.mathsisfun.com/mixed-fractions.html

Anjali said:   10 years ago
How did you know that the time found was in terms of hours?

Aneesh said:   1 decade ago
Hey guys anyone clearly say how does the value 7/2 came?

Prudhvi (palakol) said:   8 years ago
Simple 3.5 + 0.25 = 3.75,
3.75/75 = 0.05,
0.05 * 60 = 3.

Deepti said:   1 decade ago
Time = Distance/ Dpeed.

Speed= 75 mph, distance= 15/4.

Kunal hire said:   9 years ago
How to convert min into an hour? Please anyone explain.


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