InfyTQ Time and Work Quiz 2

Answer: Option B

Explanation:

C's 1 day's work =	1	-		1	+	1		=	1	-	7	=	1	.
	3			6		8			3		24		24

A's wages : B's wages : C's wages =	1	:	1	:	1	= 4 : 3 : 1.
	6		8		24

C's share (for 3 days) = Rs.

3 x

1/24

x 3200

= Rs. 400.

Ravi can alone build the wall in 5 days.

Sanjay can alone build the wall in 8 days.

Mukund can alone build the wall in 10 days.

Due to climatic changes the individual time required for each to complete the work has increased to 20%, 25% & 50% respectively.

To find: time required to build the wall if Ravi, Sanjay & Mukund work together.

Since the individual time required to build the wall has increased due difficult terrain and slushy conditions at site.

The new time taken by three of them individually will be

Ravi can alone build the wall in = (120/100) * 5 = 6 days.

Sanjay can alone build the wall in = (125/100) * 8 = 10 days.

Mukund can alone build the wall in = (150/100) * 10 = 15 days.

So, in 1 day

Ravi can do = (1/6)th of work

Sanjay can do = (1/10)th of work

Mukund can do = (1/15)th of work

∴Total work done in 1 day if three of them work together = 1/6 + 1/10 + 1/15 = 10/30 = 1/3

By unitary method, we can get

If 1/3rd of whole work is done in 1 day.

Then,

The whole work will be done in = 1/(1/3) = 3 days.

∴Total time required by Ravi, Sanjay & Mukund to build the wall, if they work together = 3 days.

In this question 10 printer print 10 copies in 10 minute
It means that 1 printer can print one copy in 10 Minute
so the 100 print is printed by 200 printer in 10 Minute
Because one printer can print 1 copy in 10 Minute so the time does not change
Therefore, option C) is the correct answer

 Solution:  Option : D

Explanation:D alone will take 1/20 – 1/50 – 1/60 = 4/300 = 1/75
⇒ 75 days to complete the work.

work done by thomas in day=1/7
work done by other in a day=1/9
work done by both in a day=1/7 +1/9 =16/63
days required by both = 63/16 = ~4

Video solution:

jake=1/48 units per day
paul=1/24 units per day
ans:48
jake+paul+hari=1/8
1/48 + 1/24 + 1/x =1/8
1/x=1/48
so Hari take 48 days to dig a well alone

Video solution:

B\'s 10 day\'s work = ( 1/15 x 10 ) = 2/3

Remaining work = ( 1 - 2/3 ) = 1/3

Now, 1/18 work is done by A in 1 day.

Therefore 1/3 work is done by A in ( 18 x 1/3 ) = 6 days.