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\\November 3, 2023 12:46 PM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74

Example 3: What time will it be at 3 hours 40 minutes after 6:30 p.m.?
Solution: h min
1
Step 1: Convert 6:30 p.m. into 24-hour clock. 18 30
6:30 p.m. = 1830 hours = 18 hours 30 minutes + 3 40

Step 2: Add 3 hours 40 minutes and 18 hours 30 minutes. 22 10
� 30 minutes + 40 minutes = 70 minutes

70 minutes = 60 minutes + 10 minutes = 1 hour + 10 minutes
� 1 hour + 18 hours + 3 hours = 22 hours

Step 3: Required time = 22 hours 10 minutes = 2210 hours = 10:10 p.m.

Example 4: Subtract 18 years 9 months from 23 years. Years Months
Solution: We have, 23 years = 23 years 00 months 22 12

= 22 years 12 months – 23 00
09
18
and 18 years 9 months = 18 years 09 months 4 03
Required difference = 4 years 3 months

Example 5: The running time of a Vande Bharat train from New Delhi to Varanasi is 8 hours.
If the train departs from New Delhi station at 6:15 a.m., at what time will it reach Varanasi?
Solution: The train will reach Varanasi 8 hours later than 6:15 a.m.

So, we add 8 hours to 6:15 a.m.
6:15 a.m. = 06 hours 15 minutes

8 hours = + 08 hours 00 minutes
= 14 hours 15 minutes
14 hours 15 minutes = 2:15 p.m.

Thus, the train will reach Varanasi at 2:15 p.m.

Knowledge Desk

Vande Bharat Train is the fastest train in India. The coaches of the train are fitted with
automatic sliding door and all the coaches are attached to each other. The first Vande Bharat
Train was flagged off on New Delhi - Kanpur - Varanasi on Feb 15, 2019.

Example 6: Mayank’s school starts at 7:30 a.m. and closes at 2:15 p.m.
Find the working hours of the school. school
Solution: Closing time of the school = 2:15 p.m.
= 1415 hours

Opening time of the school = 7:30 a.m. = 0730 hours
h
Working hours of the school = 1415 hours – 0730 hours 13 min
75
= 0645 hours 14 15
= 6 hours 45 minutes – 7 30
Thus, the working hours of the school is 6 hours 45 minutes. 6 45

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