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प्रश्न
Running Exercise
The doctor has told Devi Prasad to run 2 km every day to stay fit. He took one round of this field. How far did he run?
The field was very far from his home. So he chose a park nearby. The boundary of the park was about 400 metres long.
- How many rounds of the park must Devi Prasad run to complete 2 km?
- One day the weather was very good and a cool breeze was blowing. He felt so good that he kept jogging till he got tired after 8 rounds. That day he ran ____ km and ____ metres!
उत्तर
Devi Prasad ran one round the field
= 500 m + 500 m + 500 m + 500 m
= 2000 m
= 2000 ÷ 1000 km
= 2 km
(1) 2 km = 2 × 1000 m
= 2000 m
So to complete 2000 m, Devi Prasad must complete
= 2000 m ÷ 400 m
= 5 rounds
Devi Prasad has to run 5 rounds of the park.
(b) Devi Prasad covers a distance in 8 rounds = 400 m × 8
= 3200 m
= 3000 m + 200 m ...(3000 m = 3000 ÷ 1000 = 3 km)
= 3 km 200 m
That every day he ran 3 km and 200 m.
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संबंधित प्रश्न
Try This.
Draw a broom half as long as this broom.
Have you heard about marathon races in which people have to run about 40 kilometres? People run marathons on roads because the track of a stadium is only 400 metres.
10 rounds of a stadium track = _____ km
Have you heard about marathon races in which people have to run about 40 kilometres? People run marathons on roads because the track of a stadium is only 400 metres.
So, if you run a marathon on a stadium track, you will have to complete ______ rounds!
Here are the Indian Records and World Records for some jumps.
| Sports | World Record | Indian Record |
| High Jump (Men) | Javier S. (2m 45 cm) | Chandra Pal (2m 17 cm) |
| Long Jump (Men) | Mike P. (8m 95 cm) | Amrit Pal (8m 8 cm) |
| High Jump (Women) | Stefka K. (2m 9 cm) | Bobby A. (1m 91 cm) |
| Long Jump (Women) | Galina C. (7m 52 cm) | Anju G. (6m 83 cm) |
Find out from the table -
How many centimeters higher should Bobby A. jump to reach 2 meters?
[Remember that 1m = 100 cm
Half metre = ?]
Look for things that are between 10 and 20 centimetres long.
Which is longer? Thumb or little finger?
Guess the length of different parts of your body and check if your guess is correct. You can use a scale, string, measuring tape etc.
Can you draw a road shorter than these? What is the length of that road?
Which of these is nearer to the railway line?
Agra Fort or Taj forest?
Draw lines to match each picture with how long it can be.
|
Length of an earthworm |
2 kilometres |
|
Height of a child |
5 metres |
|
Width of a finger nail |
10 centimetres |
|
Length of a Sari |
1 centimetre |
|
Distance from home to school |
1 metre |
