word problem for mathematics

label Mathematics
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schedule 1 Day
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May 20th, 2015

let the speed be x ,
so time take for journey = 336/x hours

had the speed been 6+x
time taken = 336/(6+x)

since time taken is 1 hour less, 336/x - 336/(6+x) = 1
336( 6+x - x)/x(x+6) = 1
336*6= x^2 + 6x
x^2 + 6x - 2016 = 0
x = 42 and -48

so, the answer is 42


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May 20th, 2015

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