Wheels of diameters 7 cm and 14 cm start rolling simultaneously from…

Question

Wheels of diameters 7 cm and 14 cm start rolling simultaneously from X and Y, which are 1980 cm apart, towards each other in opposite directions. Both of them make the same number of revolutions per second. If both of t…

Accepted Answer

Option A. 22 cm/sec. Answer & Solution Answer: Option A Solution: Let each wheel x revolutions per second Then, [ ( 2 × 7/2 × x ) + ( 2 × 7 × x ) ] × 10 = 1980 ( 227 × 7 × x ) + ( 2 × 227 × 7 × x ) = 198 & 66x = 198 & x = 3 Distance moved by smaller wheel in 3 revolutions : & = ( 2 × 227 × 7/2 × 3 )…

Wheels of diameters 7 cm and 14 cm start rolling simultaneously from X and Y, which are 1980 cm apart, towards each other in opposite directions. Both of them make the same number of revolutions per second. If both of them meet after 10 seconds, the speed of the smaller wheel is :

Solution