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If (a + b) = 7 and ab = 12, what is the value of (a^2 + b^2)?
A25
B29
C37
D49
A car covers a distance of 480 km in 8 hours. If its speed is increased by 20 km/h, how much time will it take to cover the same distance?
A5 hours
B6 hours
C6.5 hours
D7 hours
A train 150 meters long passes a telegraph post in 10 seconds. What is the speed of the train in km/h?
A48 km/h
B54 km/h
C60 km/h
D72 km/h
If a worker can complete 1/4 of a work in 5 days, how many days will he take to complete 3/4 of the work?
A12 days
B15 days
C18 days
D20 days
What is the area of an isosceles right triangle with equal sides of length 8 cm?
A16 cm²
B24 cm²
C32 cm²
D64 cm²
The ratio of two numbers is 3:5 and their HCF is 12. What is their LCM?
A120
B150
C180
D240