Advertisements
Advertisements
Question
A bowler throws a cricket ball at a speed of 120 km/h. How long does this ball take to travel a distance of 20 metres to reach the batsman?
Advertisements
Solution
The speed of the cricket ball = 120 km/h
= `(120 xx 1000)/60` m/min ...[∵ 1 km = 1000 m and 1 h = 60 min]
= 2 × 1000
= 2000 m/min
Now, speed in m/s = `2000/60` ...[∵ 1 min = 60 s]
= `200/6`
= `100/3` m/s
So, 20 m can be cover in `20/(100/3)` ...`[∵ "Time" = "Distance"/"Speed"]`
= `60/100`
= 0.6 s
APPEARS IN
RELATED QUESTIONS
A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of the base that need to be added.
| Parts of red pigment | 1 | 4 | 7 | 12 | 20 |
| parts of base | 8 | .... | .... | .... | .... |
Rashmi has a road map with a scale of 1 cm representing 18 km. She drives on a road for 72 km. What would be her distance covered in the map?
Fill in the blank in of the following so as to make the statement true:
x and y are said to vary directly with each other if for some positive number k ....,...... = k.
Sita can finish typing a 100 page document in 9 hours. Mita in 6 hours and Rita in 12 hours. How long will they take to type a 100 page document if they work together?
The cost of 12 quintals of soyabean is 36,000 rupees. How much will 8 quintals cost?
The shadow of a pole with height of 8 m is 6 m. If the shadow of another pole measured at the same time is 30 m, find the height of the pole?
If the cost of 3 books is ₹ 90, then find the cost of 12 books.
A truck needs 54 litres of diesel for covering a distance of 297 km. The diesel required by the truck to cover a distance of 550 km is ______.
If x and y are in direct proportion, then (x – 1) and (y – 1) are also in direct proportion.
Here is a key board of a harmonium:
- Find the ratio of white keys to black keys on the keyboard.
- What is the ratio of black keys to all keys on the given keyboard.
- This pattern of keys is repeated on larger keyboard. How many black keys would you expect to find on a keyboard with 14 such patterns.
