Question

There are six printers at "Today's news" newspaper, each printing at the same constant rate. Working together, the six printers can complete printing tomorrow's newspaper within 12 hours. If the owner wishes to reduce the printing time to 8 hours, how many additional printers, each with the same constant rate, will he need to purchase?

Answer 1

Explanation:

6 printer 12 hours me newspaper printed karte h

To agar time kam kar diya jae to

2 additional printer ans

Answer 2

3 additional printers of the same capacity are required.

Explanation:

Given:

• no. of printers of constant rate engaged in the printing work, $n=6$

• amount of time each printer works, $t=12\ hr$

Now, the total machine hours of  work is given as:

$n\times t=6\times 12$

Now on reducing the printing time to 8 hours:

Total machines required to perform the same machine hours:

$n'=\frac{n.t}{8}$

$n'=\frac{72}{8}$

$n'=9$

Therefore, no. of additional machines required:

$\Delta n=n'-n$

$\Delta n=9-6$

$\Delta n=3$

#TOPIC: work and time

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