Advertisements
Advertisements
प्रश्न
A train covers 51 km in 3 hours. Calculate its speed. How far does the train go in 30 minutes?
उत्तर
Given: Distance = 51 km
Time = 3 hours
∴ Speed = `"Distance"/"Time"`
= `51/3`
= 17 km/h
Now,
Time = 30 minutes = `30/60` h = `1/2` h
Speed = 17 km/h
∴ Distance travelled = Speed × Time
= `17xx1/2`
= 8.5 km
APPEARS IN
संबंधित प्रश्न
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 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?
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.
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?
Rohit goes 350 km in 5 hours. Find:
(i) his speed
(ii) the distance covered by Rohit in 6.2 hours
(iii) the time taken by him to cover 210 km.
A boy drives his scooter with a uniform speed of 45 km/h. Find the time taken to cover 900 m.
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 -
- About how far can a motorboat go in six hours?
| 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 |
