The ratio of speeds of two cyclists is 4:5. If the duration of cycling is the same for both, then find the distance travelled by the second cyclist, if the first cyclist covers a distance of 18 km.
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Step-by-step explanation: Since distance d is the same d = st
At 15 km/h, takes shorter time t
At 10 km/h, takes longer time (t + 2/3)
15(t) = (t + 2/3)10 => 15t = 10t + 20/3
5t = 20/3 => t = 20/15 = 4/3 h.
d = st = 15(4/3) or 10(2/3 + 4/3) = 20 km.
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