Q1.saleem can type 30 words per minute and ranjit can type 50 words per minute. if saleem needs 30 minutes to finish typing a piece of work, how long will ranjit rake to finish the same work?
20 MEN CAN COMPLETE THE COSTRUCTION OF ROAD IN 30DAYS. IF 5 MORE MEN JOIN THE TEAM , IN HOW MANY DAYS WILL THE WORK BE OVER?
Answers
Saleem types at 30 words per minute.
Ranjit types at 50 words per minute
If Saleem requires 30 minutes to finish
typing a job then he has 30 * 30 words
to type = 900 words
Ranjit, typing at 50 words per minute
requires 900/50 = 18 minutes to type the same piece of work.
Q2.
20 workers x 30 days = 600 worker days
So the project requires 600 worker days.
Let x be the number of days after which 5 workers leave.
So [x * 20 ] + 15*(35-x) = 600
20x + 525 - 15x = 600
5x = 75
x = 15 days.
So 5 workers must leave after 15 days for the project to complete in 35 days.
1. Given:
Saleem can type at 30 words/min
Ranjit can type at 50 words/min
Saleem can finish the work in 30 minutes.
To Find:
Find the time taken by Ranjit to finish the work.
Solution:
Let the time and speed of Saleem be T₁ and S₁.
T₁= 30 min
S₁=30w/m
so total work is T₁×S₁=30×30
Total work = 900 words.
Let the time and speed of Ranjit be T₂ and S₂.
T₂=?
S₂=50w/m
Total work = T₂× S₂
900 =T₂×50
∴ T₂=18 min.
Hence Ranjit can finish the work in 18 minutes.
2. Given:
20 men can complete the work in 30 days.
To Find :
Find the time taken by 25 men.
Solution:
N₁=20
T₁=30
N₂=25
T₂=?,
We know,
N₁ T₁= N₂ T₂
20×30=25× T₂
∴ T₂=24
Hence 25 men can finish the work in 24 days.