A.5 seconds

** B.7.5 seconds**

C.40 seconds

D.none

## 20 men or 30 boys can do a certain job in 20 days. How long will it take 6 men and 15 boys to do the same job?

**A.25 days**

B.10 days

C.8 days

D.6 days

## M and N working separately can complete a job in 6 and 12 hours respectively. If they work for an hour alternately M starting at 10:00 AM when will the job be done?

A.2:00 PM

B.8:00 PM

C.7:00 PM

**D.6:00 PM**

## 30 men can do a certain work in 15 days. They started working on the project but 5 of them leave after every five days. In how many days will the work be completed now?

**A.20 days**

B.22 days

C.25 days

D.18 days

## A and B can complete a task in 44 days when working together. After having worked together for 33 days B is called away. A completes the remaining task in the next 25 days. A can complete the job working alone in

A.140 days

B.90 days

** C.100 days**

D.84 days

## Three pipes A B and C can fill a tank in 20 hours. After working at it together for 5 hours C is closed and A and B fill it in 30 hrs. C alone can fill it in

A.35 hrs

** B.40 hrs**

C.30 hrs

D.28 hrs

## A train covers the distance d between two cities in h hours arriving 2 hours late. What rate would permit the train to arrive on schedule:

A.h-2

B.d/h-2

** C.d/(h-2)**

D.dh-2