alleryएक कार की चाल में 5 km/h की वृद्धि करने से वह 60 km की दूरी 1 घंटा पहले तय कर लेती है। उसकी मूल चाल क्या थी?
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 से s(s+5) = 300 प्राप्त होता है, अतः s = 15 km/h।
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