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RRB Junior Engineer / DMS / CMA 2015 · Question 12 of 480

The speed of a boat in still water is 15 km/h. The speed of the stream is 3 km/h. The time taken to go 12 km downstream in minutes is

Mathematics - Time and Distance

  1. Aa. 40Correct
  2. Bb. 45
  3. Cc. 50
  4. Dd. 55

Answer: A. a. 40

Explanation

Speed of a boat in still water u = 15 km/h Speed of the stream v = 3 km/h Relative speed of a boat in downstream = (u + v) = 15+3=18 km/ h .-. Required time = Distance _ 12 Speed 18 h = — x 60 min = 40 min 18

Source: Arihant RRB JE Solved Paper 26-Aug-2015 (3rd Shift), Q91–150 — published solved-paper compilation (Q1–90 technical not included in this source) · memory-based

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