Subject
Quantitative Aptitude
Topic
Speed & Distance
The effective speed of a boat travelling downstream is 20 kmph, whereas it is 10 kmph upstream. What is the speed of the stream current in kmphr?
The effective speed of a boat travelling downstream is 20 kmph, whereas it is 10 kmph upstream. What is the speed of the stream current in kmphr?
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None of theseExplanation
let, boat speed = x stream speed = y Thus, x + y = 20 ..... (1) x - y = 10 ........ (2) Now, from (1) + (2) 2x = 30 x = 15 putting value of x in eq. (1) 15 + y = 20 y = 20 - 15 = 5Related questions
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