Question

Ramu purchased a second hand Swiss watch which is very costly. In this watch the minute-hand and hour hand coincide after every $65\frac{3}{11}$ minutes How much time does the watch lose or gain per day ?

• A. $4$ min
• B. $5$ min
• C. $4$ min, $20$ sec
• D. none of these

Answer 1

Answer: (D)

none of these

Normal clock coincides in $\frac{720}{11}$ minutes.

This clock lag behind by $(65.4545-65.2727)$$=$$0.1818$

In one day it lag behind by $4.36$ min.

Correct option is D.