It takes 45 seconds for a bus to cross the 8640 meter long bridge and 35 seconds for it to cross the 610 meter long tunnel at the same speed

It takes 45 seconds for a bus to cross the 8640 meter long bridge and 35 seconds for it to cross the 610 meter long tunnel at the same speed

(8640-610) divided by (45-35) = vehicle speed

It takes 45 seconds for a bus to cross the 860 meter long bridge and 35 seconds to cross the 610 meter long tunnel at the same speed

(1) The speed of the train is (860-610) / (45-35) = 250 / 10 = 25 (M / s); (2) the body length is: 25 × 35-610 = 875-610 = 265 (m). A: the speed of this bus is 25 m / s, and the body length is 265 M

It takes 24 seconds for the train to pass through the 360 meter long first tunnel, and 16 seconds for the train to pass through the 220 meter long second tunnel
Must be a column equation!

Set the speed X
24x-360=16x-220
24x-16x=360-220
8x=140
x=17.5
A: the speed is 17.5 meters per second