XAT 2021 Time, Speed and Distance Question (Medium)

Question

Swati can row a boat on still water at a speed of 5 km hr. However, on a given river, it takes her 1 hour more to row the boat 12 km upstream than downstream. One day, Swati rows the boat on this river from X to Y, which is N km upstream from X. Then she rows back to X immediately. If she takes at l

Optima Learn · Accepted Answer

Let the speed of the stream be x km hr. Then upstream speed is 5 - x and downstream speed is 5 x . Given that it takes 1 hour more to go 12 km upstream than downstream 12 5 - x 12 5 x 1. Simplifying 12 5 x - 5 - x 25 - x 2 1 Rightarrow 24x 25 - x 2 Rightarrow x 2 24x - 25 0. Solving gives x 1 positi

XAT 2021 Time, Speed and Distance — Previous Year Question

XAT 2021

Quantitative

Time, Speed and Distance

Medium

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