DIRECT AND INVERSE PROPORTIONS 2

The distance that an automobile travels varies directly as the time it travels. If the car travels 280 miles in 7 hours, how far will it travel in 12 hours?

• 480
• 1960
• 84
• 25

The amount of money earned on a job is directly proportional to the number of hours worked. If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

• $ 2

• $ 1.57

• $ 308

• $ 265

A contractor estimates that 3 persons could rewire Jasminder’s house in 4 days. If, he uses 4 persons instead of three, how long should they take to complete the job?

• 1 days

• 2 days

• 3 days

• 4 days

In a hostel of 50 girls, there are food provisions for 40 days. If 30 more girls join the hostel, then how long will these provisions last?

• 20 days

• 25 days

• 30 days

• none of these

In a college 7 period a day each of 45 minutes duration. How long each period be, if the school has 9 period a day assuming the number of hours to be the same

• 30 minutes

• 35 minutes

• 50 minutes

• 25 minutes

The cost of a circular table is directly proportional to the square of the radius. A circular table with a radius of 40cm cost $50. What is the cost of a circular table with a radius of 60cm?

• $75

• $85

• $55

• $40

The time taken, t seconds, that it takes a water heater to boil water is inversely proportional to the power, p watts, of the water heater. When P = 2000W, T = 252 seconds. Find the time it takes to boil water when P = 800W

• 650 seconds

• 730 seconds

• 630 seconds

• 130 seconds

A research takes 125 days to be completed by 16 people work on it. Find how many people are needed to complete the research in 40 days.

• 50 people

• 55 people

• 30 people

• 35 people

7 children can build a lego house in 45 minutes. How many children can build the house in 15 minutes?

• 20 children

• 15 children

• 21 children

• 4 children

David sold 45 chocolate milk shake in 3 days. How many chocolate milk shakes can he sell in 10 days?

• 120 chocolate milk shakes

• 150 chocolate milk shakes

• 50 chocolate milk shakes

• 35 chocolate milk shakes