A) 8 hrs 45 min | B) 8 hrs 42 min |

C) 8 hrs | D) 8 hrs 34 min |

Explanation:

Number of pages typed by Adam in 1 hour = = 6

Number of pages typed by Smith in 1 hour = = 8

Number of pages typed by both in 1 hour = (6 + 8) = 14

Time taken by both to type 110 pages = (120 * 1/14) = 8 = 8 hrs 34 min.

**Sol: **Ratio of efficiency = 2:1 (A:B)

Ratio of required time = 1:2 (A:B) x:2x

but 2x-x=30

x= 30 and 2x= 60

Now efficiency of A =3.33% and efficiency of B =1.66%

Combined efficiency of A and B together = 5%

time required by A and B working together to finish the work = = 20 days

Note: Efficiency

Efficiency time = Constant Work

Hence, Required time =

whole work is always cosidered as 1, in terms of fraction and 100%, in terms of percentage.

In, general no.of days or hours =

**Sol :** A's i days work =

B's i days work =

(A+B)'s 1 day's work=

Time taken by both to finish the whole work = = 4 days

**Alternatively :**

Efficiency of A = =8.33%

Efficiency of B = =16.66%

Combined efficiency of A and B both = 8.33+16.66=25%

Time taken by both to finish the work (working together) = = 4days

A) 8 | B) 12 |

C) 16 | D) 24 |

Explanation:

1 man's 1 day work = ; 1 woman's 1 day work =

work done in 6 days=

Remaining work =

(8 men +8 women)'s 1 day work ==

Remaining work=

work is done in 1 day by 1 man

work will be done in 1 day by men