i) Time = $\frac{Distance}{Speed}$
Time taken to travel from
P to Q is $\frac{40}{x}$ hrs. Time taken to travel from Q to R is $\frac{100}{x + 6}$
If the two times are equal then
$\frac{40}{x}$ = $\frac{100}{x + 6}$
40x + 240 = 100x
240 = 60x, x = 4
the speed between Q and R is
(x + 6) = 4 + 6 = 10km/hr
ii) Total time taken is
$\frac{Total distance}{Total speed}$ = $\frac{40}{4} + \frac{100}{10}$
= 20 hours
johnmulu answered the question on March 6, 2017 at 11:47
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