What number is twice the sum of it’s digits?
A 300 ft. train is traveling 300 ft. per minute must travel through a 300 ft. long tunnel. How long will it take the train to travel through the tunnel?
Two minutes. It takes the front of the train one minute and the rest of the train will take two minutes to clear the tunnel.
A large truck is crossing a bridge 1 mile long. The bridge can only hold 14000 lbs, which is the exact weight of the truck. The truck makes it half way across the bridge and stops. A bird lands on the truck. Does the bridge collapse?
No, it does not collapse. Because it has driven a half mile - you would subtract the gas used from the total weight of the truck.