Question

In first gear, or low gear, an automobile's engine runs about three times as fast as the drive shaft. In second gear, the

engine does not have to run as fast; usually it runs about 1.6 times faster than the drive shaft. Finally, in third, or high
gear, the engine runs at the same speed as the drive shaft.
Engine speed = 2,100 r.p.m.
Transmission in first gear
Drive-shaft speed:

Answer 1

Engine is currently in first gear as mentioned in question

• Speed=2100rpm

Drive shaft speed be x

• 3x=2100
• x=700rpm

Answer 2

700 rpm

Explanation:

A driveshaft is a shaft that transmits mechanical power.

Its speed is measured in rpm (revolutions per minute).

Engine speed

• First gear: 3 × drive-shaft speed
• Second gear: 1.6 × drive-shaft speed
• Third gear: equal to drive-shaft speed

Given engine speed:

• 2,100 rpm

Therefore, the drive-shaft speeds in the different gears are:

First gear

Drive-shaft speed = 2100 ÷ 3 = 700 rpm

Second gear

Drive-shaft speed = 2100 ÷ 1.6 = 1312.5 rpm

Third gear

Drive-shaft speed = 2100 rpm