alleryਪਾਈਪ ਇੱਕ ਟੈਂਕ ਨੂੰ 8 ਅਤੇ 12 ਘੰਟਿਆਂ ਵਿੱਚ ਭਰਦੇ ਹਨ। ਦੋਵੇਂ 2 ਘੰਟਿਆਂ ਲਈ ਖੁੱਲ੍ਹਦੇ ਹਨ, ਫਿਰ ਪਹਿਲਾ ਬੰਦ ਹੋ ਜਾਂਦਾ ਹੈ। ਦੂਜੇ ਨੂੰ ਹੋਰ ਦੀ ਲੋੜ ਹੁੰਦੀ ਹੈ।
A6 ਘੰਟੇ
B9 ਘੰਟੇ
C7 ਘੰਟੇ
D8 ਘੰਟੇ
Answer & Solution
Correct answer: C. 7 ਘੰਟੇ
ਦੋ ਘੰਟੇ ਭਰਨ ਲਈ 2 x 5/24 = 5/12; ਬਾਕੀ 7/12 ਨੂੰ 1/12 ਪ੍ਰਤੀ ਘੰਟਾ ਦੀ ਦਰ ਨਾਲ ਭਰਨ ਲਈ 7 ਘੰਟੇ ਲੱਗਦੇ ਹਨ।
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