Page 225 - Touchpad Mathematics_Ver1.0_C5

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example 2. Convert:

a. 12 hours into minutes b. 6 hours 42 minutes into minutes

c. 4 days 13 hours 30 minutes into minutes

Solution. a. 1 hour = 60 minutes
12 hours = (12 × 60) minutes = 720 minutes

b. 6 hours 42 minutes = 6 hours + 42 minutes

= (6 × 60) minutes + 42 minutes

= 360 minutes + 42 minutes = 402 minutes

c. 4 days 13 hours 30 minutes
= 4 days + 13 hours + 30 minutes

= (4 × 24) hours + 13 hours + 30 minutes [Since 1 day = 24 hours]

= (96 hours + 13 hours) + 30 minutes

= 109 hours + 30 minutes

= (109 × 60) minutes + 30 minutes [Since 1 hour = 60 minutes]
= 6540 minutes + 30 minutes

= 6570 minutes

example 3. Convert:

a. 4 days into hours b. 7 days 12 hours into hours
Solution. a. 1 day = 24 hours

4 days = (4 × 24) hours = 96 hours

b. 7 days 12 hours = 7 days + 12 hours

= (7 × 24) hours + 12 hours [Since 1 day = 24 hours]

= 168 hours + 12 hours = 180 hours

example 4. Convert:

a. 3 years 9 months into months b. 4 weeks 6 days into days

Solution. a. Since 1 year = 12 months

So 3 years 9 months = 3 years + 9 months

= (3 × 12) months + 9 months

= 36 months + 9 months = 45 months

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