RRB Junior Engineer / DMS / CMA 2015 · Question 14 of 480

A can do a piece of work in 15 days and B can do the same work in 10 days. If they work together, number of days required to complete the same work is

Mathematics - Time and Work

Aa. 5
Bb. 6Correct
Cc. 7
Dd. 8

Answer: B. b. 6

Explanation

1 day’s work of A = 1 day’s work of B = - 10 .-. 1 day’s work of A and p _ 1 1 _ 2 + 3 . 15 10 30 = 14s .-. A and B complete the work = -j - 6 days

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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