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A, B, and C can complete a job in 10 days working together. A alone takes 30 days and B alone takes 20 days. How long will C take alone?
A40 days
B50 days
C60 days
D80 days
A walking speed of 5 km/h causes a student to miss the bus by 10 minutes. At 6 km/h, he arrives 5 minutes early. What is the distance?
A6 km
B7.5 km
C9 km
D12 km
How many seconds does a train 150 m long running at 54 km/h take to cross a platform 250 m long?
A20 seconds
B24.67 seconds
C26.67 seconds
D30 seconds
If a – b = 5 and a + b = 15, find the value of a^2 – b^2.
A50
B75
C100
D125
Find the perimeter of a rectangle whose length is 12 cm and breadth is 8 cm.
A20 cm
B40 cm
C80 cm
D96 cm
The diagonal of a square is 10*sqrt(2) cm. What is its side length?
A5 cm
B10 cm
C15 cm
D20 cm
A man buys a toy for Rs. 25 and sells it for Rs. 30. What is his gain percentage?
A15%
B20%
C25%
D30%