Advertisements
Advertisements
Question
Meenakshee cycles to her school at an average speed of 12 km/h and takes 20 minutes to reach her school. If she wants to reach her school in 12 minutes, her average speed should be ______.
Options
`20/3` km/h
16 km/h
20 km/h
15 km/h
Advertisements
Solution
Meenakshee cycles to her school at an average speed of 12 km/h and takes 20 minutes to reach her school. If she wants to reach her school in 12 minutes, her average speed should be 20 km/h.
Explanation:
Given, speed of cycle = 12 km/h
Time taken by Meenakshee through cycle = 20 min
Then, total distance cover = `(12 xx 20)/60` = 4 km ...[∵ Distance = Time × Speed]
If Meeanakshee want to reach her school in 12 min, then her cycle speed should be `4/(12/60)` i.e. 20 km/h. ...`[because "Speed" = "Distance"/"Time"]`
Hence, 20 km/h
APPEARS IN
RELATED QUESTIONS
Complite the following table given that x varies directly as y .
| x | 2.5 | ... | ... | 15 |
| y | 5 | 8 | 12 | ... |
8 men can do a piece of work in 9 days. In how many days will 6 men do it?
A cistern has two inlets A and B which can fill it in 12 hours and 15 hours respectively. An outlet can empty the full cistern in 10 hours. If all the three pipes are opened together in the empty cistern, how much time will they take to fill the cistern completely?
If the weight of 12 sheets of thick paper is 40 grams, how many sheets of the same paper would weigh 2.5 kilograms?
Assuming land to be uniformly fertile, the area of land and the yield on it vary ______
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
The number of people working and the quantity of work.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
Area of land and its cost.
It is given that l varies directly as m. Find the constant of proportion (k), when l is 6 then m is 18.
It is given that l varies directly as m. Find l, when m is 33.
The students of Anju’s class sold posters to raise money. Anju wanted to create a ratio for finding the amount of money her class would make for different numbers of posters sold. She knew they could raise Rs 250 for every 60 posters sold.
- How much money would Anju’s class make for selling 102 posters?
- Could Anju’s class raise exactly Rs 2,000? If so, how many posters would they need to sell? If not, why?
