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A man walks at 5 km/h for 2 hours and then runs at 10 km/h for 3 hours. What is his average speed?

A7.0 km/h

B8.0 km/h

C8.5 km/h

D9.0 km/h

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A pipe can fill a tank in 6 hours and another pipe can empty it in 8 hours. If both are opened together, how long will it take to fill the tank?

A12 hours

B18 hours

C24 hours

D30 hours

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If 3^x = 81, what is the value of 2^(2x – 3)?

A8

B16

C32

D64

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What is the square root of 0.000081?

A0.09

B0.009

C0.0009

D0.9

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A bag contains 3 red, 4 white, and 5 blue balls. Two balls are drawn at random. What is the probability that both are red?

A1/22

B3/22

C1/11

D5/22

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Present ages of A and B are in ratio 3:4. After 5 years, the ratio becomes 4:5. What is A’s present age?

A12 years

B15 years

C18 years

D20 years

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What is the simplified value of (0.2 * 0.2 + 0.2 * 0.02) / 0.04?

A1.02

B1.1

C1.2

D2.1

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The perimeter of a rectangle is 60 cm. If its length is twice its width, what is the area of the rectangle?

A150 cm²

B200 cm²

C225 cm²

D300 cm²

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If A can do a job in 10 days and B can do it in 15 days, how many days will they take working together?

A5

B6

C8

D9

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If x – y = 6 and x * y = 16, what is the value of x^2 + y^2?

A52

B64

C68

D72

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