Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is
A
1 : 50
B
3 : 20
C
3:4
D
4:3
E
20:3
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Rx = 15/0.2 = 75
Ry = 20/0.2 = 100
Rx : Ry = 75 : 100 = 3 : 4
Source: Myschool Past Questions Archive (Record #25204)