Question
A boat takes 2 hours 20 minutes to cover 140 km
downstream and 2.5 hours to cover 75 km upstream. If the boat covers 'y' km upstream and '2y' km downstream in 8 hours, find the value of 1.5y .Solution
ATQ,
Downstream speed = (140 Γ· 2.33) = 60 km/h Upstream speed = (75 Γ· 2.5) = 30 km/h Now, (y Γ· 30) + (2y Γ· 60) = 8 β (2y + 2y) Γ· 60 = 8 β 4y = 480 β y = 120 Required value = 1.5 Γ 120 = 180
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