RRB Junior Engineer / DMS / CMA 2015 · Question 15 of 480

Pand Qcan do a piece of work in 10 days, Q and R in 12 days and Rand P in 15 days. In how many days P alone can do the same work₹ 40

Mathematics - Time and Work

Aa. 24Correct
Bb. 40
Cc. 6
Dd. — Solved Paper 2015 Railway Recruitment BoardsJuniorEngineer ~ 17

Answer: A. a. 24

Explanation

1 day’s work of P and Q = 10 1 day’s work of Q and R = 1 day’s work of R and P = 1 12 1 15 .-. 1 day’s work of P,Q and R = 2M_ + _L+J_ ~ 2 Lio 12 15. 1 6+5+4 = -x-= 2 60 .-. 1 day’s work of P alone 1 1 3-2 12 24 1 24 .-. P alone can do this work = ^- = 24 days 24

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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