At what time 4 and 5 o’clock the hands of a clock coincide?

Formula  = \(\frac{60}{11}\) × (Initial hour)

= \(\frac{60}{11}\) × 4  =  \(\frac{240}{11}\)  =  21\(\frac{9}{11}\)  minutes.

So, correct answer is (1)  4 : 21\(\frac{9}{11}\)  o’clock