Advertisements
Advertisements
प्रश्न
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.
उत्तर
A can do `1/3` of work in = 10 hours
∴ A can do full work in `= (10 xx 3)/1 = 30` hours
B can do `2/5` of the work in = 12 hours
∴ B can do the whole work in =`(12 xx 5)/2` = 30 hours
(i) Now A's 1 hour's work = `1/30`
(ii) B's 1 hours work = `1/30`
(iii) Both's 1 hour's work
`=1/30 + 1/30 = 2/30 = 1/15`
∴ Both can finish the work in 15 hours
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 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?
A can do a piece of work in 4 days and B can do the same work in 5 days. Find, how much work can be done by them working together in:
- one day
- 2 days
What part of work will be left, after they have worked together for 2 days?
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 motorist travelled the distance between two towns, which is 65 km, in 2 hours and 10 minutes. Find his speed in metre per minute.
Jagan went to another town such that he covered 240 km by a car going at 60 kmh-1. Then he covered 80 km by a train, going at 100 kmh-1 and the rest 200 km, he covered by a bus, going at 50 kmh-1. 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?
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.
How long will they take to go a distance of 10 km?
Name two things that are lying to your west.
