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.
So, what I usually do is draw a division box, put the numerator (4.4) in and the denominator out and then do a normal division. <span />
The correct answer is 7.4 Because in order to change Km to m you multiply by 100
1/5( 1/2 + 1/3)
1/5 (3/6 + 2/6)
1/5(5/6)
5/30
1/6
Answer:
the answer is option D because it cant be division or multiplication and minus does not work
