how long will it take a mile-long train going 20 miles per hour to get completely through a 2-mile-long tunnel?
please explain answers no comments
2007-09-08 15:12:28 · 7 answers · asked by almeda_94 1 in Cars & Transportation ➔ Rail
At 20 MPH, it takes 3 minutes to travel a mile.
The tunnel is 2 miles long, and the train is 1 mile long.
3 miles must be traveled to clear the tunnel with the rear of the train.
3 miles x 3 minutes equals 9 minutes.
It takes 9 minutes for the train to traverse the tunnel.
2007-09-08 16:05:05 · answer #1 · answered by Samurai Hoghead 7 · 3⤊ 0⤋
20 mph means 1 mile travelled in 3 minutes.(60/20)
Back of train in tunnel after 3 minutes, 'cos it's a mile long.
6 more mins to get back of train out of tunnel.(2 miles*3 mins)
IT TAKES 9 MINUTES.
NO COMMENTS!
2007-09-12 17:47:00 · answer #2 · answered by Stephen H 2 · 0⤊ 0⤋
it takes 60 minutes for the train to travel 20 miles or
60 Minutes = 20 Miles
so now divide it by 2 and you'll get:
6 Minutes = 2 Miles
but since its a mile long train. you have to travel another mile so now its this:
9 Minutes = 3 Miles.
It will take the train 9 minutes to travel completely through the 2-mile long tunnel....
2007-09-08 22:22:30 · answer #3 · answered by John 1 · 1⤊ 1⤋
The way to answer the question is this, set up a ratio and cross multiply.
20/60 = 2/x
(So the former being, 20miles per hour, over 60 minutes. And after the equal sign, it is 2miles, over X minutes.)
20x = 60 x 2
20x - 120
Divide all by 20
6 minutes.
2007-09-08 22:19:48 · answer #4 · answered by nismo161 1 · 1⤊ 2⤋
ok. the distance is suppose to be 3miles. for the train is a mile long.
speed= distance/time taken
time taken = 20/3 =0.15hours
0.15hours=9min.
2007-09-08 22:30:53 · answer #5 · answered by Anonymous · 1⤊ 0⤋
Three days and nine minutes counting the derailment.
2007-09-09 10:49:09 · answer #6 · answered by fredrick z 5 · 2⤊ 0⤋
about one minute, at least i think it is one minute.
2007-09-08 22:17:53 · answer #7 · answered by smtgrt1 3 · 0⤊ 1⤋