A 2-wheel drive 35 HP tractor has 1.5 m rear wheel diameter. The engine runs at 1200 rev/min. the total reduction of speed is 30:1. Find the travelling speed of tractor in km/h.

(a) 12.09 kmh^-1

(b) 11.31 kmh^-1

(c) 14.90 kmh^-1

(d) 9.99 kmh^-1

This question was posed to me in unit test.

This intriguing question comes from Traction and Traction Theory in division Farm Tractor of Farm Machinery