Time and Work

Time and Work

1. Work from Days:

   If A can do a piece of work in n days, then A's 1 day's work =	1	.
   	n

2. Days from Work:

   If A's 1 day's work =	1	,	then A can finish the work in n days.
   	n

3. Ratio:
   If A is thrice as good a workman as B, then:
   Ratio of work done by A and B = 3 : 1.
   Ratio of times taken by A and B to finish a work = 1 : 3.

Speed, Time and Distance:

Speed=(Distance/Time), Time =(Distance/Speed), Distance = (Speed x Time).

km/hr to m/sec conversion:

x km/hr =(x x 5/18)m/sec.

m/sec to km/hr conversion:

x m/sec =(x x 18/5)km/hr.

If the ratio of the speeds of A and B is a : b, then the ratio of the

the times taken by then to cover the same distance is 1/a:1/b or b : a.

Suppose a man covers a certain distance at x km/hr and an equal distance at y km/hr. Then,

the average speed during the whole journey is(2xy/x + y)km/hr.

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