alleryਇੱਕ ਯਾਤਰਾ ਦੇ ਤਿੰਨ ਬਰਾਬਰ ਪੈਰ 20, 30 ਅਤੇ 60 ਕਿਲੋਮੀਟਰ/ਘੰਟਾ ਦੀ ਰਫ਼ਤਾਰ ਨਾਲ ਚਲਾਏ ਜਾਂਦੇ ਹਨ। ਪੂਰੀ ਯਾਤਰਾ ਲਈ ਔਸਤ ਗਤੀ ਕਿੰਨੀ ਹੈ?
A40 km/h
B35 km/h
C30 km/h
D25 km/h
Answer & Solution
Correct answer: C. 30 km/h
ਹਾਰਮੋਨਿਕ ਔਸਤ: 3 / (1/20 + 1/30 + 1/60) = 3 / (1/10) = 30 ਕਿਲੋਮੀਟਰ/ਘੰਟਾ।
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