The tail of the train starts one mile from the mouth of the tunnel and it must travel that distance plus the length of the tunnel in 3 minutes.
Let t = tunnel length
t + 1 = distance the tail must travel in 3 minutes.
3 minutes = 1/20 hr
(t+1) miles / 60 m/hr = 1/20 hr
t + 1 = 60/20
t+1 = 3
Subtract 1 from each side:
t = 2
The tunnel is 2 miles long.
Answer:
Root
Step-by-step explanation:
Not too sure about this one, but I believe it is
A root is a number that makes an equation true.
lol id i would help if i knew it
-5 + -2 = -7
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