Let us consider some of the word problems on measurement of time i.e. hours, minutes and seconds.

**Examples on addition of hours, minutes and seconds:**

1. A train leaves Delhi for Tundla at 7:30 a.m. It takes 5 ours to reach at Tundla. At what time it reach at Tundal?

The train departs at hr. min.

Time taken to reach at Tundla 7 30

The train will reach at Tundla __+ 5 00__

12 30

Therefore, the train will reach Tundla at 12:30 p.m.

2. Sam leaves for school at 6:35 a.m. It takes him 1 hr. 45 min.
to reach the school. At what time will he reach the school?

Sam leaves for school at hr. min.

Time taken to reach the school 6 35

Sam will reach the school at __+ 1 45__

7 80

7 hr. 80 min. = 7 hr. + 60 min. + 20 min.

= 7 hr. + 1 hr. + 20 min.

= 8 hr. 20 minutes.

Therefore, Sam will reach the school at 8:20 a.m.

**Examples on
subtraction of hours, minutes and
seconds:**

1. Ron left for his school at 6:35 a.m. He reached the school at 8:25 a.m. How much time did Ron take to reach the school?

Ron reached his school at 7:25 a.m.

He left for his school at 6:35 a.m.

Time taken by him to reach the school

= 7 hr. 25 min - 6hr. 35 min

= 0 hr. 50 min.

Therefore, time taken by Ron to reach the school is 50 minutes.

**2.** Ken left his home at 4:30 p.m. to play cricket. He came at 7:15
p.m. How long was he away from his home?

Ken came back at 7:15 p.m.

He left home at 4:30 p.m.

He was away from home = 7 hr. 15 min. - 4 hr. 30 min.

= 2 hr. 45 min.

Therefore, Ron was away from home 2 hours 45 minutes

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