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ibps-rrb-os1 2017 Β· Question 42 of 74

A boat can travel 9.6 km downstream in 36 min. If speed of the water current is 10% of the speed of the boat in downstream. How much time will boat take to travel 19.2 km upstream.

Speed, Time & Distance

  1. A2 hours
  2. B3 hours
  3. C1.25 hours
  4. D1.5 hoursCorrect
  5. E1 hour

Answer: D. 1.5 hours

Explanation

𝑆𝑝𝑒𝑒𝑑 π‘œπ‘“ π‘‘π‘œπ‘€π‘›π‘ π‘‘π‘Ÿπ‘’π‘Žπ‘š = 9.6 36 π‘˜π‘š π‘šπ‘–π‘› ⁄ = 16 π‘˜π‘š/β„Žπ‘Ÿ Speed of current = 1.6 km/hr Let speed of man in still water = π‘₯ So, π‘₯ = 16 – 1.6 = 14.4 km/hr π‘…π‘’π‘žπ‘’π‘–π‘Ÿπ‘’π‘‘ π‘‘π‘–π‘šπ‘’ 𝑖𝑛 π‘’π‘π‘ π‘‘π‘Ÿπ‘’π‘Žπ‘š = 19.2 14.4βˆ’1.6 = 1.5 β„Žπ‘œπ‘’π‘Ÿπ‘ 

Source: IBPS RRB PO Prelims 2017 Memory Based Paper (Adda247) Β· memory-based

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