একটি চৌবাচ্চায় দুটি নল সংযুক্ত আছে । প্রথম নল দ্বারা চৌবাচ্চাটি ৪ মিনিটে পূর্ণ হয় এবং ২য় নল দ্বারা ১২ মিনিটে পূর্ণ হয় । নল দুটি একত্রে খুলে দিলে চৌবাচ্চাটি কতক্ষণে পূর্ণ হবে ?
A৩
B৪
C৫
D৬
Answer: A - ৩
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A closed rectangular tank contains a certain amount of water, When the tank is placed on is 3 ft by 4 ft side, the height of the water in the tank is 5 ft , When the tank is placed on another side of dimensions 4 ft by 5 ft, What is the height in feet, of the surface of the water above the ground?
A3 feet
B4 feet
C5 feet
D6 feet
Answer: A - 3 feet
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To fill a tank, 25 buckets of water is required. How many buckets of water will be required to fill the same tank if the capacity of the bucket is reduced to two-fifth of its present?
A10
B35
C62.5
DNone of these
Answer: C - 62.5
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A swimming pool is initially filled to a depth of 96 inches, After 2 wees, the depth has decreased to $92\tfrac{1}{2}$ inches. Assuming that the depth decreased at a constant rate, after how may days would the water depth have reached $92\tfrac{1}{2}$ inches?
A3
B6
C7
D9
Answer: B - 6
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A pipe fills a tank in P minutes and another pipe fills the tank in q minutes, A different pipe makes the tank empty in r minutes. If all these tree pipe are opened then in how many minutes the tank will be full ?
A(p + p - q) / pqr
B(pq + pr - pq) pqr
C(pq + qr - pr) / pqr
DNone
Answer:
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