Advertisements
Advertisements
प्रश्न
A boy drives his scooter with a uniform speed of 45 km/h. Find the time taken to cover 900 m.
Advertisements
उत्तर
To find the time taken to cover 900 m
Convert speed to m/s
Since 1 km/h = `5/18` m/s
45 km/h = `45xx5/18` = 12.5 m/s
`"Time" = "Distance"/"Speed"`
Substitute the values:
`"Time" = "900 m"/"12.5 m/s"`
= 72 seconds.
APPEARS IN
संबंधित प्रश्न
A can do a piece of work in 4 days and B can do the same work in 5 days. Find, how much work can be done by them working together in:
- one day
- 2 days
What part of work will be left, after they have worked together for 2 days?
A and B take 6 hours and 9 hours respectively to complete a work. A works for 1 hour and then B works for two hours.
(i) How much work is done in these 3 hours?
(ii) How much work is still left?
A, B and C can do a piece of work in 12, 15 and 20 days respectively. How long will they take to do it working together?
Mohit can complete a work in 50 days, whereas Anuj can complete the same work in 40 days. Find:
(i) work done by Mohit in 20 days.
(ii) work left after Mohit has worked on it for 20 days.
(iii) time taken by Anuj to complete the remaining work.
A is able to complete `1/3` of a certain work in 10 hrs and B is able to complete `2/5` of the same work in 12 hrs. Find:
(i) how much work can A do in 1 hour ?
(ii) how much work can B do in 1 hour ?
(iii) in how much time will the work be completed, if both work together.
I travel a distance of 10 km and come back in `2 1/2` hours. What is my speed?
Jagan went to another town such that he covered 240 km by a car going at 60 kmh-1. Then he covered 80 km by a train, going at 100 kmh-1 and the rest 200 km, he covered by a bus, going at 50 kmh-1. What was his average speed during the whole journey?
These log boats do not go very far. If the wind is helpful, then travel about 4 km in one hour.
Guess how far you can go in one hour if you walk fast.
Look at the different types of boats.
Some boats have motors and go further into the sea. since they go far out they can catch more fish. These boats travel faster, at a speed of about 20 km in one hour.
How far would the motorboats go in three and a half hours?
A runner covers 900 m in 3 min. Speed in m s⁻¹ is:
