RRB Paramedical Staff Nurse Model Paper 9

Question : 51 of 100

Marks: +1, -0

The total distance between two destinations is ‘x’ km. If the distance travelled along the stream is thrice of the total distance and the distance travelled against the stream is double of the total distance. If the time taken to cover the distance along the stream is 40% less than the time taken to cover the distance against the stream. If Sundar covers a distance of 21 km in 1 hour 24 minutes along the stream, then find the stream speed?

2.5 kmph
3.5 kmph
1.5 kmph
4.5 kmph

Validate

Solution:

T(down)/T(up)

= 60/100

T(down)

= {3x}/\text "Downstream Speed"

T(up)

={ 2x}/\text "Upstream Speed"

Downstream Speed

= 21/(84{/}60) = 15

kmph

60/100 = [{3x}{/}15]/[{2x}{/}\text "Upstream Speed"]

Upstream Speed

= 6

kmph
Stream Speed

= 15 -6 {/} 2 = 4.5

kmph

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