Question
The perimeter of semicircle is 36 cm and the radius of
the semicircle is equal to the height of a Cylinder whose volume is 198 cm 3 . then find the radius of that cylinder.Solution
The perimeter of semicircle = 36 (π ×R) + 2R = 36 22/7 R + 2R = 36 R = 7 cm Hence height of cylinder = 7 cm 
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A car travels 120 km at a speed of 40 km/h and returns at a speed of 60 km/h. Find the average speed of the car for the whole journey.
Let A={1,2,3}, and B={x ∈ Z ∣ 1≤x≤4}. The total number of injective functions from A to B is:
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(5.5% of 470) – (6.5% of 510) +2= ?
A car covers the first 40 km of a journey at 60 km/h and the next 60 km at 90 km/h. What is the average speed for the entire journey?
