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If the radius of the circle  and  are increasing uniformly w.r.t. times as 0.3 and 0.4 unit/sec, then they will touch each other at  equal to

a)

45 sec

b)

90 sec

c)

11 sec

d)

135 sec



Question ID - 55822 | SaraNextGen Top Answer

If the radius of the circle  and  are increasing uniformly w.r.t. times as 0.3 and 0.4 unit/sec, then they will touch each other at  equal to

a)

45 sec

b)

90 sec

c)

11 sec

d)

135 sec

1 Answer
127 votes
Answer Key / Explanation : (b) -

(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

127 votes


127