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Harish switched on a bulb at 01∶23∶44 hours and switched it off on the same day at 11∶14∶38 hours. For how long was the bulb in switched-on mode?

Harish switched on a bulb at 01∶23∶44 hours and switched it off on the same day at 11∶14∶38 hours. For how long was the bulb in switched-on mode? Correct Answer 09 hours 50 mins 54 secs

Required difference = 11 ∶ 14 ∶ 38 - 01 ∶ 23 ∶ 44

We know 1 hour = 60 mins and 1 min = 60 secs

⇒ 11 hours 14 mins 38 secs = 11 hours 13 mins 60 + 38 secs = 11 hours 13 mins 98 secs

Again, 11 hours 13 mins 98 secs = 10 hours 60 + 13 mins 98 secs = 10 hours 73 mins 98 secs

   10 ∶ 73 ∶ 98

 - 01 ∶ 23 ∶ 44

   09 ∶ 50 ∶ 54

∴ The correct answer is 09 hours 50 mins 54 secs.

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