alleryস্থিৰ পানীত 15 km/h দ্ৰুতিৰ এখন নাও 5 km/h সোঁতৰ গতিত 40 km সোঁতৰ অনুকূলে যায় আৰু ঘূৰি আহে। মুঠ সময় কিমান?
A8 hours
B7 hours
C5 hours
D6 hours
Answer & Solution
Correct answer: D. 6 hours
সোঁতৰ অনুকূলে 40 / 20 = 2 h আৰু সোঁতৰ প্ৰতিকূলে 40 / 10 = 4 h, মুঠ 6 hours।
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