Question
The ratio between the speeds of Y and Z is 8 : 7. When Y
boosts his speed by 12.5%, he covers 432 km in 6 hours. Find the time taken by Z to travel 168 km.Solution
Increased speed of Y = (432/6) = 72 km/hr
So, actual speed of Y = 72 ÷ 1.125 = 64 km/hr
Or, speed of Z = 64 × (7/8) = 56 km/hr
Therefore, required time = (168/56) = 3 hours
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