Wheels of diameters 7 cm and 14 cm start rolling simultaneously from X to Y, which area 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 (in cm/sec)
(a)
22
(b)
44
(c)
66
(d)
132
Wheels of diameters 7 cm and 14 cm start rolling simultaneously from X to Y, which area 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 (in cm/sec)
(a)
22
(b)
44
(c)
66
(d)
132
Question ID - 50579 | SaraNextGen Top Answer
Wheels of diameters 7 cm and 14 cm start rolling simultaneously from X to Y, which area 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 (in cm/sec)
(a)
22
(b)
44
(c)
66
(d)
132
|
Wheels of diameters 7 cm and 14 cm start rolling simultaneously from X to Y, which area 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 (in cm/sec) |
|||||||
|
(a) |
22 |
(b) |
44 |
(c) |
66 |
(d) |
132 |
Let each wheel make 
revolutions per sec.
Then, 
Distance moved by smaller wheel in 3 revolutions = 
cm.
Speed of smaller wheel = 
cm/s.