Word Problems on Measurement of Time
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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