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    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_11\Chap_11
                 \ 10-Nov-2025  Bharat Arora   Proof-8                                     Reader’s Sign _______________________ Date __________

                            Exercise 11G

                    1.  Add the following:

                        a.  35 min 38 s and 18 min 17 s.                  b.  24 min 18 s and 5 min 20 s.

                        c.  28 min 38 s and 29 min 40 s.                  d.  15 min 30 s and 30 min 35 s.
                        e.  16 h 35 min 10 s and 25 h 16 min 20 s.         f.  100 h 45 min 56 s and 5 h 19 min 12 s.

                    2.  Find the difference between:

                        a.  25 h 24 min and 10 h 9 min.                   b.  24 h 38 min and 9 h 40 min.

                        c.  10 min 6 s and 5 min 26 s.                    d.  24 h 40 min 10 s and 4 h 56 min 16 s.
                    3.  Ram travelled 15 hours 20 minutes by one bus and 13 hours 54 minutes by another
                        bus. For how much time did he travel in total?

                    4.  Nitu’s  mother  takes  42  minutes  12 seconds  to  make  dal
                        and 53 minutes  28 seconds  to  make  chapatis. In how
                        much time will her lunch be ready?

                  5.  Putul  takes  55 minutes  20 seconds  to complete  her
                        homework.  Her brother Ajay  takes  1 hour 10 minutes
                        20 seconds to complete his homework. Who takes a longer time to complete their

                        homework and by how much?

                     a.m. (ante-meridiem): Denotes time from 12 midnight to 12 noon.
                     p.m. (post-meridiem): Denotes time from 12 noon to 12 midnight.
                     The 24-hour clock tells the time using 4 digits (HHMM).
                       •  The first two digits show hours (00 to 23).

                       •  The last two digits show minutes (00 to 59).
                       •   For p.m. times (after noon), typically add 12 to the hour
                          (e.g., 3:00 p.m. = 03:00 + 12:00 = 15:00 hours).
                      Time can be converted between different units using standard relationships:
                       1 minute = 60 seconds, 1 hour = 60 minutes, 1 day = 24 hours, 1 week = 7 days.
                     The above relationships  can be  used,  when needed,  to  regroup  in the  addition  and
                       subtraction of time.

                       194       Mathematics 4

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