Passing on a Truck over a bridge

Puzzle # 12

There is a bridge that can withstand a total weight of Maximum 10 Tons. Above which the bridge will be collapsed !

• Bridge covers a total distance of 5KM.
• This bridge is maintained by highly authorised officials who will thoroughly check the vehicle before allowing to passed over it.
• Under any circumstance, officials are allowed Max of 10 Tons over the bridge.

A Truck weigh exactly 10 Tons(Load + Truck + Driver..) i.e it includes everything? It is allowed to cross over the bridge and after covering a distance of 4.75 KM. A crow (Max - 1.5 KG) came and sat over the truck. Luckily bridge didn't got collapsed. What could be the reason behind this? When driver didn't dropped any of his items or truck parts!!


Solution
1 TON = 1000Kgs

Truck weighs exactly 10,000 Kgs and is moving on the Bridge.As Truck travelled a distance of 4.75 Kms on bridge then it should have consumed some fuel. 
On an average truck will consume 1 liter of Diesel for every 3 Kms that it has travelled.

Truck has travelled around 4.75 Kms, then it should have reduced by weight more than 1.5 Kgs. This reduced weight will compensate the weight of the Crow that came and sat on the Truck.

Hence Truck has crossed bridge without getting collapsed!!


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