A mile long train traveling at 60 mph is about to enter a mile long tunnel. How long will it take for the entire train to pass through the tunnel?
2007-05-27 07:59:56 · 3 answers · asked by lazydaisy4991 2 in Science & Mathematics ➔ Mathematics
The train travels 1 mile per minute. After 1 minute the engine is ready to emerge from the tunnel. After 1 more minute, the end of the train will emerge from the tunnel. Thus total time is 2 minutes.
2007-05-27 08:04:59 · answer #1 · answered by ironduke8159 7 · 0⤊ 0⤋
There are three elements to this reply. The first is to see how lengthy it is going to take the entrance of the coach to go out the tunnel. That is how lengthy at 60kmh will the entrance take to journey 1km. Speed of the coach is 60kmh, so it is going to quilt 1km in one million/60 of an hour - or one million minute (if the velocity is whatever else, difference the 60 to some thing the velocity is, if the space alterations in different questions, simply multiply it by means of the brand new distance. The entrance of the coach will take one million minute to go into and go away the tunnel. Next is to discover out how lengthy after the coach enters the tunnel that the again of the coach enters the tunnel. This is very similar to earlier than. The again of the coach will quilt 1km in one million minute, by means of natural accident the coach is 1km lengthy and in order the entrance leaves the again enters. If the coach used to be a further period you would discover the time it takes for the again to go into after the entrance has and upload that point change to the last reply. The final side is strictly the identical as the primary, how lengthy will it take the again of the coach to go away the tunnel and for the reason that the back and front are touring on the identical velocity it is going to take the identical time, one million minute So this offers an reply of: Time for Front to move by way of the tunnel + time change among entrance leaving and again getting into + time for again to move by way of. or on this case one million + zero + one million = two mins
2016-09-05 13:44:29 · answer #2 · answered by gonzalaz 4 · 0⤊ 0⤋
How far does the front of the train go from the point where it enters the tunnel until the tail of the train leaves the tunnel?
2007-05-27 08:05:09 · answer #3 · answered by donaldgirod 2 · 0⤊ 0⤋