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                 \ 10-Nov-2025  Bharat Arora   Proof-8                                     Reader’s Sign _______________________ Date __________

                           11

                                                                             Time

                    LEARNING ObjEctIvEs

                     After studying this chapter, students will be able to...

                        y  read and write time in hours, minutes and seconds
                        y  convert 12-hour format to 24-hour format and vice versa
                        y  find the time duration between two events
                        y  calculate the number of days between two events
                        y  convert units of time—days, hours, and minutes to each other
                        y  add and subtract measures of time

                                                                                                21 st
                                                                                               Century   #Subject Enrichment
                                                                                                Skills
                     Warm Up
                                                        Railway Timetable

                   A railway timetable tells us about the arrival and departure times of a train. You
                   must have seen it at a railway station. The timetable helps people who have to
                   travel by train.

                   Kanika, a student of Class 4, is making

                   a timetable of some trains for a station.
                   Look at the timetable given on the next
                   page.  Some  entries  in the  timetable

                   are missing. Can you  find the missing
                   information?  Each train departs  an
                   hour after its time of arrival.

                       180       Mathematics 4

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