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.

A) 6 days | B) 5 days |

C) 4 days | D) 3 days |

Explanation:

B's 8 days work=

Reaining work=

Now, work is done by A in 1 day

work is done by A in = 5 days

A) 4 days | B) 6 days |

C) 8 days | D) 10 days |

Explanation:

Ratio of rates of working of A and B =2:1. So, ratio of times taken =1:2

A's 1 day's work=1/9

B's 1 day's work=1/18

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

so, A and B together can finish the work in 6 days

A) 20days | B) 40 days |

C) 50 days | D) 60 days |

Explanation:

(A+B)'s 1 day's work=1/20

C's 1 day work=1/60

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

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

we get: 2 * (A's 1 day 's work)=1/15

=>A's 1 day's work=1/30

B's 1 day's work=

So, B alone could do the work in 60 days.

A) 60/11 | B) 61/11 |

C) 71/11 | D) 72/11 |

Explanation:

P can complete the work in (12 * 8) hrs = 96 hrs

Q can complete the work in (8 * 10) hrs=80 hrs

P's 1 hour work=1/96 and Q's 1 hour work= 1/80

(P+Q)'s 1 hour's work = =

so both P and Q will finish the work in hrs

Number of days of 8 hours each =

A) 1/24 days | B) 7/24 days |

C) 24/7 days | D) 4 days |

Explanation:

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

so, A,B and C together will complete the work in 24/7 days.