On monday Preetha slept for 7 hrs 15 mins and 35 sec at night and 1 hr 27 mins 52 secs in the afternoon..For how many hours did she sleep in all on Monday
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Answer:
8.72 hours
Step-by-step explanation:
(7+1) hours+ (15+27) min + (35+52) sec
= 8 hrs +42 min + 87 sec
= 8 hrs + (42/60) hrs + (87/(60×60)) hrs
= 8.72 hours
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