Advertisements
Advertisements
प्रश्न
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 ______.
विकल्प
`20/3` km/h
16 km/h
20 km/h
15 km/h
Advertisements
उत्तर
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
संबंधित प्रश्न
Fill in the blank in of the following so as to make the statement true:
If u = 3 v, then u and v vary .... with each other.
Reema weaves 35 baskets in 25 days. In how many days will she weave 55 baskets?
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?
Every 3 months Tamilselvan deposits ₹ 5000 as savings in his bank account. In how many years he can save ₹ 1,50,000
When the speed remains constant, the distance travelled is ______ proportional to the time.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
Sales Tax and the amount of the bill.
In a camp, there is enough flour for 300 persons for 42 days. How long will the flour last if 20 more persons join the camp?
A car travels a distance of 225 km in 25 litres of petrol. How many litres of petrol will be required to cover a distance of 540 kilometres by this car?
Campus and Welfare Committee of school is planning to develop a blue shade for painting the entire school building. For this purpose various shades are tried by mixing containers of blue paint and white paint. In the following mixtures, decide which is a lighter shade of blue and also find the lightest blue shade among all of them.
| Mixture A | Mixture B |
 |
 |
If one container has one litre paint and the building requires 105 litres for painting, how many container of each type is required to paint the building by darkest blue shade?
Ravi starts for his school at 8:20 a.m. on his bicycle. If he travels at a speed of 10 km/h, then he reaches his school late by 8 minutes but on travelling at 16 km/h he reaches the school 10 minutes early. At what time does the school start?
