alleryएका कारचा वेग 5 km/h ने वाढवल्यास तिला 60 km चा मार्ग पूर्ण करण्यासाठी 1 hour कमी लागतो. तिचा मूळ वेग किती होता?
A12 km/h
B15 km/h
C10 km/h
D20 km/h
Answer & Solution
Correct answer: B. 15 km/h
60/s - 60/(s+5) = 1 वरून s(s+5) = 300 मिळते, म्हणून s = 15 km/h.
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