A helicopter covers around a square field by 200 km/hr, 300 km/hr, 400 km/hr and 600 km/hr respectively. Find average speed of the helicopter.

In a game of billiards, A can give B 12 points in 60 and A can give C 10 points in 90. How many can C give B in a game of 70? 

Jone and Sara can together finish a piece of work in 50 days. They worked together for 30 days and then Sara left. After another 40 days Jone finished the work. How many days will it take for Jone to complete the work alone?

If 20 adults and 17 children can complete a given task in 3 days and 18 adults and 9 children can do it in 5 days, then what is the ratio of the work done daily by an adult to a child?

The average speed of a school bus in duty hours is 60 km/hr and average speed of the same bus in off-duty hours is 78km/hr.If the school bus has to stopsat N stops during duty hours ,find for how many minutes in an hour the bus stops on an average in duty hours? 

A certain distance is covered with a certain speed. If half the distance is covered in double the time, then the ratio of the speed to that of the original one is? 

The rate at which Annie chops the vegetables is 50% more than that of Nanny. If both of them chop the vegetables simultaneously, they take 2 hours to fill the container. The time taken by Nanny to fill the container alone is:

Ishaan covers half of his journey at 24 km/h and the remaining at 72 km/h. Find his average speed. 

A 375 m long train is running at a speed of 75 km/h. In how much time will it across a platform 750 m long? 

Arvind can do a piece of work in 10 days and Bhupesh in 20 days. They work together but 2 days before the completion of the work, Arvind leaves. In how many days was the work completed? 

A train passes an electric pole standing on the platform in 14 seconds and passes the platform completely in 56 seconds. If the length of the platform is 420 meters, then the length of the train is? 

In a camp, there is sufficient food for 280 people for 30 days. If after 21 days 40 more people join with eating efficiency 30% less than others. Then find for how many days the remaining amount of food will last for a new group of people?

Shivam sets out to cycle from point A to B; and at same time Hemant starts from B to A. After passing each other they complete their journeys in 4 and 16 hours respectively. At what rate does Hemant cycle if Shivam cycle at 18 km per hour?

25 labors are employed to construct a building in 375 days. If 25 additional laborers are employed at the end of 200 days, then how many more days will it take to complete the construction of a building?

Amit and Braj together can complete a job in 12 days. Braj and Chinmay together can complete a job in 10 days.Amit and Chinmay  can complete the same work in eight days Find the minimum time taken by them to complete twice the work if exactly two people works on any day and no one work on every 4th day.[ Note:A single person cannot take rest for 2 consecutive days and cannot work for 3 consecutive days] 

Deva moves along the perimeter of a rectangular park of length 33 m and breadth 22m in 10 seconds. How many seconds will he take to move along a circular park of radius 70 m with double the speed ? 

Machine A, B, and C, working alone take 20,10 and 5 day to make 2000 bolts each. If the defect in their daily production is 4%,5% and 9% approximately respectively. Find number of days taken to produce 5000 defect less bolts when all the machines are working simultaneously. 

Two trains run around a circular track at the rate of one round per hour and five rounds per hour respectively. They start from the same point in the same direction at 9 a.m. When they will cross each other for the first time? 

Two poles, one double in length of other, are standing opposite to each other at a distance of Y meter. If the angle of elevation from mid-point of the line joining their feat are complementary then what is the height of the shorter pole?

Ramesh takes twice as much time as Manjar and thrice as much time as Suraj to complete a job. If working together, they can complete the job in 4 days,find the time taken by Manjar to complete the work.