Advertisements
Advertisements
Question
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?
Advertisements
Solution
Shaheed's 1 day's work = `1/3`
and Shaif's 1 day's work = `1/4`
Both one day's work `= 1/3 + 1/4 = (4 + 3)/12 = 7/12`
∴ Both can prepare the chair in =`12/7` days
`= 1 5/7` days
One chair is prepared in = `1 5/7` days
∴ 14 chairs will be prepared in = `12/7 xx 14 = 24` days.
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, 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?
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, 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.
A train travels 700 metres in 35 seconds. What is its speed in km/h?
A boy drives his scooter with a uniform speed of 45 km/h. Find the time taken by him to cover 108 km.
A man walks a distance of 5 km in 2 hours. Then he goes in a bus to a nearby town, which is 40 km, in further 2 hours. From there, he goes to his office in an autorickshaw, a distance of 5 km, in `1/2` hour. What was his average speed during the whole journey?
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?
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 |
If a car travels at a constant speed of 45 km/h for 3 hours, what distance will it cover?
