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gate ece

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As the bridge is of negligible length only the length of the vehicles is of concern here. And the distance that should be left after each vehicle  should also be taken into account.

Total  length needed for each truck = 30

Total  length needed for each car = 20

average length of a vehicle= 25 (as no of each vehicle is not given. makes no sense! agreed :-) ).

speed = distance / time

total distance = no of vehicles* 25 and time = 1hr

25*n / 1= 36*1000

n = 36000/25 = 1440
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