A train that is 1 mile long starts through a tunnel that is also 1 mile long. The train is traveling 15 miles per hour. How long does it take for the train to get completely out of the tunnel?

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To solve this problem, we need to calculate the time it takes for the entire train to exit the tunnel.

First, let's determine the distance the train needs to cover to get completely out of the tunnel. The train's length is 1 mile, and it also needs to travel an additional distance equal to the tunnel's length, which is another 1 mile. So, the total distance the train needs to travel is 1 mile + 1 mile = 2 miles.

Next, we can use the formula time = distance / speed to calculate the time it takes for the train to travel this distance.

Given that the train is traveling at a speed of 15 miles per hour, we can substitute the values into the formula:

time = 2 miles / 15 miles per hour
time = 0.1333 hours or approximately 8 minutes

Therefore, it will take approximately 8 minutes for the train to completely exit the tunnel.

Use this proportion. Cross multiply and solve for x -- the time it takes the front of the train to go through the tunnel.

15/60 = 1/x
15x = 60
x = 60/15 = 4 minutes for the front of the train to go through the tunnel.

It takes the rear of the train the same time.

7.5 min