NCERT Solutions for Class 4th Maths Chapter 12 How many hours in a day? — In-text Questions
Book page 178 Updated on2026-09-19
Q1.
Look at the picture below. It shows the time spent on different activities by a doctor. Write the number of hours spent on each activity in the space provided.The doctor’s day drawn as a 24-hour wheel. Each dotted box asks for the number of hours between two marks.
Answer
The doctor’s day drawn as a 24-hour wheel. Each dotted box asks for the number of hours between two marks.
Read the two marks at the ends of each dotted box and count the hours between them.
From
To
What the doctor does
Hours
6 o’clock morning
8 o’clock morning
Cooks and gets ready to go to Hospital
2 Hrs
8 o’clock morning
9 o’clock morning
Goes to the hospital
1 Hr
9 o’clock morning
4 o’clock evening
Stays at Hospital
7 Hrs
4 o’clock evening
5 o’clock evening
Comes back home
1 Hr
5 o’clock evening
6 o’clock evening
Resting time
1 Hr
6 o’clock evening
7 o’clock evening
Cooking
1 Hr
7 o’clock evening
8 o’clock evening
Spending time with children
1 Hr
8 o’clock evening
10 o’clock night
Dinner and TV
2 Hrs
10 o’clock night
6 o’clock next morning
Sleeps
8 Hrs
The same wheel with every dotted box filled in.
2 + 1 + 7 + 1 + 1 + 1 + 1 + 2 + 8 = 24 Hrs
Why it happens: Between two marks on the wheel you simply count the hour steps, the same way you count steps on a number line.
Tip: In the picture the shaded band marked Stays at Hospital reaches up to 5 o’clock, but the mark Leaves for home is placed at 4 o’clock. Count from the marks: 7 hours at the hospital and 1 hour on the way home.
Q2.
Then, find the total number of hours between 6 o’clock morning to 6 o’clock evening and 6 o’clock morning of the next day. The total number of hours is ________ .The doctor’s day drawn as a 24-hour wheel. Each dotted box asks for the number of hours between two marks.
Answer
The doctor’s day drawn as a 24-hour wheel. Each dotted box asks for the number of hours between two marks.
Count the two halves of the wheel one after the other.