Advertisements
Advertisements
प्रश्न
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?
उत्तर
Distance covered = 600 km
Time taken = 3 hr 20 min
= `3 20/60=3 1/3=10/3`hrs
∴ Speed in km/h = `"Distance"/"Time"`
= `600/(10/3)`
= `(600xx3)/10` km/h
= 180 km/h
and Speed in m/sec = `(180xx1000)/(60xx60)`
= 50 m/sec
and Distance covered in 50 seconds
= Speed × Time
= 50 × 50 m
= 2500 m or 2.5 km
APPEARS IN
संबंधित प्रश्न
Two taps can fill a cistern in 10 hours and 8 hours respectively. A third tap can empty it in 15 hours. How long will it take to fill the empty cistern, if all of them are opened 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 train covers 51 km in 3 hours. Calculate its speed. How far does the train go in 30 minutes?
A train travels 700 metres in 35 seconds. What is its speed in km/h?
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.
I travel a distance of 10 km and come back in `2 1/2` hours. What is my speed?
Mr. Amit can walk 8 km in 1 hour 20 minutes. How long will it take him to walk:
(i) 2500 m?
(ii) 6.5 km?
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?
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.
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 |
