Advertisements
Advertisements
प्रश्न
The table shows the time four elevators take to travel various distances. Find which elevator is fastest and which is slowest.
| Distance (m) | Time (sec.) | |
| Elevator- A | 435 | 39 |
| Elevator- B | 448 | 28 |
| Elevator- C | 130 | 10 |
| Elevator- D | 85 | 5 |
How much distance will be travelled by elevators B and C separately in 140 sec? Who travelled more and by how much?
उत्तर
On the basis of given table,
Elevator A takes 29s to cover 435 m.
∴ Distance covered by elevator A in 1s = `435/29` = 15 m
Elevator B takes 28s to cover 448 m.
∴ Distance covered by elevator B in 1s = `448/28` = 16 m
Elevator C takes 10s to cover 130 m.
∴ Distance covered by elevator C in 1s = `130/10` = 13 m
Elevator D takes 5s to cover 85 m.
∴ Distance covered by elevator D in 1s = `85/5` = 17 m
Hence, in 1s, elevator D covers more distance as compare to elevators A, B and C. So, elevator D is fastest, while elevator C covers least.
Hence elevator C is slowest.
Now, elevator B covers distance in 140s = 140 × 16 = 2240 m ...[∵ Distance = Speed × time]
Elevator C covers distance in 140s = 140 × 13 = 1820 m
∴ Elevator B covers more distance than C = 2240 – 1820 = 420 m
APPEARS IN
संबंधित प्रश्न
A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time the length of the shadow cast by another pole 10 m 50 cm high.
A woker is paid Rs 200 for 8 days work. If he works for 20 days, how much will he get?
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?
A postman can sort out 738 letters in 6 hours. How many letters can be sorted in 9 hours?
If x varies directly as y, then
| x | 12 | 6 |
| y | 48 | – |
A car is travelling 48 km in one hour. The distance travelled by the car in 12 minutes is ______.
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.
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 E | Mixture F |
 |
 |
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?
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?
