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
Correct Answer: Option C
Explanation
Rx = 15/0.2 = 75
Ry = 20/0.2 = 100
Rx : Ry = 75 : 100 = 3 : 4