= 12 hours 10 minutes - 7 hours 35 minutes + 18 hours 58 minutes= (12 hours + 18 hours) + (10 minutes - 35 minutes + 58 minutes)= 30 hours + (10 - 35 + 58) minutes= 30 hours + 33 minutes= 30 hours 33 minutes
Therefore, 12 hours 10 minutes - 7 hours 35 minutes + 18 hours 58 minutes = 30 hours 33 minutes.
= 12 hours 10 minutes - 7 hours 35 minutes + 18 hours 58 minutes
= (12 hours + 18 hours) + (10 minutes - 35 minutes + 58 minutes)
= 30 hours + (10 - 35 + 58) minutes
= 30 hours + 33 minutes
= 30 hours 33 minutes
Therefore, 12 hours 10 minutes - 7 hours 35 minutes + 18 hours 58 minutes = 30 hours 33 minutes.