If the radius of the circle |
|||||||
a) |
45 sec |
b) |
90 sec |
c) |
11 sec |
d) |
135 sec |
If the radius of the circle |
|||||||
a) |
45 sec |
b) |
90 sec |
c) |
11 sec |
d) |
135 sec |
(b)
Given circles are
…(i)
and …(ii)
Let
, hence the two circles are separated
Radius of the two circles at time are
and
For the two circle to touch each other
or
or
or
The two circles will touch each other externally in 10 seconds and internally in 90 seconds