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Exercise 6.6, , 1. Addition :, (a) 2 hours, , 10 min and 1 hour

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Sol., , (a) 2 hours 10 min, 1 hours 20 min, 3 hours 30 min, , (b) 4 hours 35 min, +3 hours 40 min, 7 hours 75 min, , = 7 hours +.75 min, =7 hours + 60 min + 15 min, = 7 hours + | hours + 15 min, = 8 hours 15 min, 2. Add the following : ., (a) 1 hour 10 min 20 sec and ., 3 hours 20 min, , (b) 2 hours 50 min 30 sec and, 1 hour 10 min 30 sec, , Sol., 1 hour 10 min 20 sec, +3 hours 20 min 00 sec, 4 hours 30 min 20 sec, , (a), , 2 hours 50 min 30 sec ~, +] hour 10 min 30 sec, 3 hours 60 min 60 sec, , (b), , 3 hours + 60 min + 60 sec, = 3 hours + 1 hour + 1 min + 0 sec, , = 4 hours +1 min + 0 sec, — 4 hours 1 min, , 3. Add :, (a)7 months and 2 years 3 months, , (b) 4 years 5 months and 1 year, , § months., , Sol., (a) 0 years 7 months, , +2 years 3 months, , 2 years 10 months

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Sol., , (b), , 4 years 5 months, , +1 year 8 months, , 5 years 13 months, , = 5 years + 13 months, , = 5 years + 12 months + 1 month, = 5 years + 1 year + 1 month, , = 6 years 1 month, , Exercise 6.7, , Find the difference :, , (a), , (b), , (c), , (d), , (a), , (b), , (c), , (d), , 8 hours 30 min and 2 hours, 10 min, , 10 hours 30 min 20 sec and |, 8 hours 20 min 15 sec, , 11 years 5 months and 6 years |, 2 months, , 7 years 2 months and 3 years, 6 months, , 8 hours 30 min, — 2 hours 10 min, 6 hours 20 min, , 110, 10 hours 30 min 2 0 sec, , — 8hours 20 min 15sec, BEE, , 2 hours 10 min 05 sec, 80, , 11 years 5 months, ~ 6 years 2 months, eS SOMOS, , 5 years 3 months, , 14, 7 years 2 months, , —3 years 6 months, , eS, 3 years 8 months, 2 ss

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-. 12 months + 2 months = 14, 2. Find the Time : monty, (a) 4 hours before 5:30 pm, (6) 2 hours after 11:00 am, (c) 6 hours before 4:30 am, (d) 1 hour 45 min after 8:30 am, Sol., (a) 4 hours before 5:30 pm, 4 hours = 30 minutes + 3 hours +, 30. minutes, 30 minutres before 5:30 pm = 5.00 pm, 3 hours before 5:00 pm = 2:00 pm, 30. minutes before 2:00 pm = 1:30pm, (6) 2 hours after 11:00 am, 1 hour after 11:00 am = 12:00 100, 1 hour after 12:00 noon = 1:00 P®, Second method :, 2 hours after | 1:00 am, , 11:00, +2:, 13:00, i.e. 12:00 + 1:00, = 1:00 pm, , (¢) 6 hours before 4:30 am |, , +, fs, 6 hours = 30 minutes + 4 be pte’, + 30m", hour git, , 30 minutes before 4:30 am = “” 00, 4 hours before 4:00 am = ! i hl