Advertisements
Advertisements
प्रश्न
Shabnam takes 20 minutes to reach her school if she goes at a speed of 6 km/h. If she wants to reach school in 24 minutes, what should be her speed?
Advertisements
उत्तर
Shabnam’s speed = 6 km/h = `(6 xx 1000)/60` m/min
∴ Total distance covered by Shabnam in 20 min = `(6 xx 1000)/60 xx 20` ...[∵ Distance = Speed × Time]
= `1000/10 xx 20`
= 100 × 20
= 2000 m
If she want to reach the school in 24 min, then she should maintain the speed = `2000/24`
= `1000/12`
= `500/6` m/min
= `(500 xx 60)/(1000 xx 6)` ...`[∵ 1km = 1/1000 and 1h = 60 min]`
= 5 km/h
APPEARS IN
संबंधित प्रश्न
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.
A, B and C working together can do a piece of work in 8 hours. A alone can do it in 20 hours and B alone can do it in 24 hours. In how many hours will C alone do the same work?
If 600 rupees buy 15 bunches of feed, how many will 1280 rupees buy?
Distance travelled by a bus and time taken are in direct proportion
A group of 21 students paid ₹ 840 as the entry fee for a magic show. How many students entered the magic show if the total amount paid was ₹ 1680?
If half a meter of cloth costs ₹ 15. Find the cost of `8 1/3` meters of the same cloth
A truck requires 108 liters of diesel for covering a distance of 594 km. How much diesel will be required to cover a distance of 1650 km?
If 25 metres of cloth costs Rs 337.50, then what will be the length of the cloth bought for Rs 810?
44 cows can graze a field in 9 days. How many less/more cows will graze the same field in 12 days?
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` |
