Clearly, the motorcyclist move both ways at a speed of 24km/hr. So, average speed of the motorcyclist = 24km/hr The boat sail or moves downstream = 20 + 8 = 28 km/hr Boat sail or moves upstream = 20 – 8 = 12 km/hr So, average of the boat = (2 × 28 × 12 )/(28 + 12) = 672/40 = 16.8 km/hr Since, the average speed of the motorcyclist is greater, he will return to A first.
Rs.1581 is divided among A, B and C in the ratio 10 : 15 : 6. What is the share of B?
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