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 | .... | .... | .... | .... |
A car is travelling at the average speed of 50 km/hr. How much distance would it travel in 12 minutes?
Aasheesh can paint his doll in 20 minutes and his sister Chinki can do so in 25 minutes. They paint the doll together for five minutes. At this juncture they have a quarrel and Chinki withdraws from painting. In how many minutes will Aasheesh finish the painting of the remaining doll?
A cistern can be filled by one tap in 8 hours, and by another in 4 hours. How long will it take to fill the cistern if both taps are opened together?
Two mobiles cost 16,000 rupees. How much money will be required to buy 13 such mobiles?
Assuming land to be uniformly fertile, the area of land and the yield on it vary ______
If x and y are in direct proportion, then (x – 1) and (y – 1) are also in direct proportion.
It is given that l varies directly as m. Find l, when m is 33.
If 25 metres of cloth costs Rs 337.50, then what will be the cost of 40 metres of the same type of cloth?
44 cows can graze a field in 9 days. How many less/more cows will graze the same field in 12 days?
