# Whats the most inefficient mode of transport

This is actually pretty tough to answer because of many variables.

The formula to be used in this case is mass x velocity x time.

But we also have to take into account the number of people capable of using each mode of transportation. So the solutions that we come up with have to be divided by the number of people that each mode can transport.

We have to assume that the distance is the same for each trip. Let's just say 1 kilometer. We also have to make some assumptions about the mass of some vehicles, the number of people that can ride on a train, and the average speed at which each mode operates.

Hopefully, nobody cares if I use the metric system.

I am going to assume that a person weighs 70 kilos (about 150 pounds).

Walking:

Mass = 70 kilos

Avg speed = 5 kph = 1.4 m / s

Time to travel 1 km = 720 sec

Energy = 70560 units

Bicycling:

Ave mass of a bicycle = 10 kilos (the mass of my bike)

Avg speed of a bicycle = 25 kph = 5.6 m / s

(source: http://en.wikipedia.org/wiki/Bicycle_weight_and_po... )

Total mass with rider: 80 kg

Time to travel 1 km = 144 s

Energy = 64512 units

Train:

Avg speed = 200 kph = 56 m/s

Avg mass = 299,000 kg

Passenger total = 309 people (although it is unlikely it will be full)

Added mass from passengers = 21,000 kg

Total mass = 320,000 kg

(source: http://en.wikipedia.org/wiki/Pendolino)

Time to travel 1 km = 18

Energy = 1,044,000 units per person

Car with 5 passengers:

Avg speed of a car = 80 kmh = 22 m / s (total assumption, there are an abundance of possibilities depending on where you are)

Avg mass of a car = 1600 kg

(source: http://www.newrules.org/voice2004/factoids/index.h... )

Added mass of passengers = 350 kg

Total mass = 1950 kg

Time to travel 1 km = 45 s

Energy = 390,000 units per person

Moped:

Avg mass =70 kg (assumption)

Avg speed = 40 kph = 11 m / s (assumption)

Total mass with passenger = 140 kg

Time to travel 1 km = 90 s

Energy = 138,600 units

Horseback:

Avg mass = 460 kg

Avg speed = 50 kmh = 14 m / s

(source: http://en.wikipedia.org/wiki/Horse )

Total mass with rider = 530 kg

Time to travel 1 km = 72 s

Energy = 534,240

So the answer is the bicycle.

Cool, I am glad that is over with.

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