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What is the oldest and cheapest mode of transporting cargo?

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+1 vote
in Irrigation Engineering by (75.2k points)
What is the oldest and cheapest mode of transporting cargo?

(a) Rail routes

(b) Road routes

(c) Air routes

(d) Water routes

This question was addressed to me in final exam.

I want to ask this question from Navigable Waterways Requirements topic in division River Navigation & Tank Irrigation of Irrigation Engineering

1 Answer

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by (106k points)
Correct answer is (d) Water routes

To elaborate: Water transport is cheaper because the coefficient of friction on the water is small. On the water, one horsepower can pull 4 tonnes while on road and rail, it can move approximately 0.15 tonne and 0.5 tonnes respectively.

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