By adding proper arithmetic symbols between the seven four, the result of operation can be 1984.4 = 1984 Add proper arithmetic sign between 7 4 to make the result of operation be 1984 In addition, one train is 160 meters long, and it takes 30 seconds for the whole train to cross the 440 meter bridge. How many meters does this train travel per second?

About the train!
The time from the front of the car just getting on the bridge to the rear of the car leaving the bridge is 30 seconds!
The distance of the car is (160 + 440 =) 600 meters!
So the speed of the car is 600 / 30 = 20 m / s

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