Advertisements
Advertisements
Question
A boy drives his scooter with a uniform speed of 45 km/h. Find the time taken to cover 900 m.
Advertisements
Solution
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
RELATED QUESTIONS
A can do a piece of work in 6 days and B can do it in 8 days. How long will they take to complete it together?
A and B working together can do a piece of work in 10 days B alone can do the same work in 15 days. How long will A alone take to do the same work?
Shaheed can prepare one wooden chair in 3 days and Shaif can prepare the same chair in 4 days. If they work together, in how many days will they prepare:
(i) one chair?
(ii)14 chairs of the same kind?
A train travels 700 metres in 35 seconds. What is its speed in km/h?
A racing car covered 600 km in 3 hours 20 minutes. Find its speed in metre per second. How much distance will the car cover in 50 sec?
A boy drives his scooter with a uniform speed of 45 km/h. Find the distance covered by him in 1 hour 20 min.
These log boats do not go very far. If the wind is helpful, then travel about 4 km in one hour.
How long will they take to go a distance of 10 km?
From where you are, what interesting things do you see to your east?
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 much time will they take to go 85 km?
In one trip the logboat brings about 20 kg of fish. But other types of boats bring a bigger catch as given in the table. The table also shows the speed of each type of boat, which is how far each boat goes in one hour. Look at the table and calculate -
- If a long tail boat has to travel 60 km how long will it take?
| Type of boat | Catch of fish in one trip (in kg) |
Speed of the boat (how far it goes in one hour) |
| Log boat | 20 | 4 km per hour |
| Long tail boat | 600 | 12 km per hour |
| Motorboat | 800 | 20 km per hour |
| Machine boat | 6000 | 22 km per hour |
