A train passes a pole in 15 seconds and passes a platform 100 m long in 25 seconds. What is the length of train?
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Solution
Let the length of train is x m
∴
x = 150 m
A motor car takes 10 seconds to travel 900 m. What is its speed in km per hour?
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Solution
Speed =
=
8 children and 12 men complete a work in 9 days. Each child takes twice the time taken by a man. In how many days will 36 men finish the same work?
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Solution
1 man = 2 children
∴ 12 men + 8 children = 12 + 4 = 16 men
∴ 16 × 9 = 36 × D
D = 4 days
A hall is 15 m long and 10 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is.
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Solution
2 (15 + 10) × h = 2 [15 × 10]
h = 6
∴ Volume = 15 × 10 × 6 = 900 m3
A Boat takes 90 minutes less to travel 36 km downstream than to travel the same distance upstream. It the speed of boat in still water is 10 kmph than the speed of the stream is:-
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Solution
Let the speed of stream is x kmph
∴
x = 2 kmph [Solve from options]
Find the number which when subtracted from the terms of the ratio 11 : 23 makes it equal to the ratio 3 : 7.
How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple Interest ?
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Solution
81 =
T = 4 years
A sum of Rs. 1350 divided among A, B and C in the ratio 2 : 3 : 4. Find the difference between the shares of A & C-
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Solution
Difference between A's & C's share =
Which is the greatest among
A sold a book for Rs. 136 and thus lost 15%. At what price he should sell it to gain 15%?
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Solution
Selling price =