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
A loaded truck travels 14 km in 25 minutes. If the speed remains the same, how far can it travel in 5 hours?
Rakesh can do a piece of work in 20 days. How much work can he do in 4 days?
A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. How much time will A alone take to finish the work?
8 men can do a piece of work in 9 days. In how many days will 6 men do it?
If the cost of 3 books is ₹ 90, then find the cost of 12 books.
A car is travelling 48 km in one hour. The distance travelled by the car in 12 minutes is ______.
From the following table, determine if x and y are in direct proportion or not.
| x | 3 | 6 | 15 | 20 | 30 |
| y | 12 | 24 | 45 | 60 | 120 |
A swimming pool can be filled in 4 hours by 8 pumps of the same type. How many such pumps are required if the pool is to be filled in `2 2/3` hours?
The cost of 27 kg of iron is Rs 1,080, what will be the cost of 120 kg of iron of the same quality?
Match each of the entries in Column I with the appropriate entry in Column II
| Column I | Column II |
| 1. x and y vary inversely to each other | A. `x/y` = Constant |
| 2. Mathematical representation of inverse variation of quantities p and q |
B. y will increase in proportion |
| 3. Mathematical representation of direct variation of quantities m and n |
C. xy = Constant |
| 4. When x = 5, y = 2.5 and when y = 5, x = 10 | D. `p oo 1/q` |
| 5. When x = 10, y = 5 and when x = 20, y = 2.5 | E. y will decrease in proportion |
| 6. x and y vary directly with each other | F. x and y are directly proportional |
| 7. If x and y vary inversely then on decreasing x | G. `m oo n` |
| 8. If x and y vary directly then on decreasing x | H. x and y vary inversely |
| I. `p oo q` | |
| J. `m oo 1/n` |
