A circular track measures 400 m. Amy runs the first round at the speed of 100m per minute. She then runs the second round at the speed of 80 m per minute. What is the average speed for the two rounds ?

Michael was sick on the day of the final examination for mathematics. The average score of the rest of the students in the class was 94 marks. Michael scored 65 marks for the make-up examination. The class average then became 93. How many students were there in the class ?

Aureila’s average score for her Mathematics test was 90 at first. She scored 100 for the final test. Her average score for the final test. Her average score for the tests became 92. How many tests had she sat for altogether ?

Jonathan scored 96 for English and 88 for science. What would be his score for mathematics if the average score for the three subjects was 93 ?

The Mathematic Olympiad Club in the school has 108  members. What are the average class sizes if the members are divided into 3 classes and 6 classes respectively ?

Rita scored an average of 90 marks in three tests. She then took another test and the average score of all the four tests became 92. How many marks did she score in the fourth test ?

A, B and C are three different numbers. The average of A, B and C is 40. When A is changed to 50, the average becomes 50. What is the original value of A ?

Calvin scores 92, 93, 94 and 97 marks for English, Science, Chinese and Mathematics respectively in the first semestral assessment. What is Calvin’s average marks for these four subjects ?

Two trains start their journeys from the same station but in the opposite direction. How far apart are the two trains right after 5 hours if one travels at 60 kilometres per hour and the other travels at 70 kilometres per hour ?

Town A and Town B are 900 kilometres apart. A car that travels at 80 kilometres per hour leaves Town A for Town B. At the same time, another car leaves Town B for Town A at 70 kilometres per hour. When will the two cars meet ?

Port A and Port B are 250 kilometres apart. Two ships depart from Port A and Port B respectively at the same time. The two ships sail towards each other and meet 10 hours later. What is the speed of the other ship if one of the ships travels at 12 kilometres per hour ?

Two cyclists start their journeys from the same place but in the opposite direction. Their speeds are 250 and 200 metres per minute respectively. How far are they apart after 5 minutes ?

Town A and Town B are 1010 km apart. A car leaves Town A for Town B at a speed of 80 km/h. Two hours later, another car leaves Town B for Town A at a speed of 90 km/h. When will the two cars meet each other ?

A car travels faster than a van by 20 km/h. Both vehicles are 1100 km apart before they start to travel to awards each other.  Find the speed of each vehicles if they meet five hours late.

The library and the school are 660 m apart. Dianne walks from the school towards the library at a speed of 60 m/min. Lawrence walks from the library towards the school at a speed of 50 m/mn. How far apart are they after 8 min ?