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Option 4 : 800 km 

Given:

Distance covered by air = 1200 km

Formula:

Speed = distance/time

Calculations:

Let the total distance be y km.

Then, 2y/5 = 1200

⇒ y = (1200 x 5) /2 = 3000 km.

Distance traveled by train

⇒ (1/3 X 3000) = 1000 km.

Distance traveled by bike

⇒ km.

⇒ 800 km.

∴ Distance travelled by bike is 800 km

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