Advertisements
Advertisements
प्रश्न
A, B and C together finish a work in 4 days. If A alone can finish the same work in 8 days and B in 12 days, find how long will C take to finish the work.
Advertisements
उत्तर
A. B and C finish work together in = 4 days.
A. B and C finish work together in 1 day = `1/4`
A' one day work = `1/8`
B's one day work = `1/12`
∴ C's one day work `= 1/4 - (1/8 + 1/12)`
`= (6 - (3 + 2))/24 = 1/24`
∴ C can finish the work in = 24 days
APPEARS IN
संबंधित प्रश्न
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?
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?
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 motorist travelled the distance between two towns, which is 65 km, in 2 hours and 10 minutes. Find his speed in metre per minute.
I travel a distance of 10 km and come back in `2 1/2` hours. What is my speed?
Nazar travelled 360 Km at the speed of 90 Km/hour. Find the time taken for his travel
Fathima reached 480 Km at the speed of 120 Km/hour. How much time did she travelled?
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 -
- About how much fish in all will each type of boat bring in seven trips?
| 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 |
If a car travels at a constant speed of 45 km/h for 3 hours, what distance will it cover?
