Question

A boat covers a total downstream distance of 180 km, split into two equal parts. The boat’s speeds in these two parts are 2a km/h and 4a km/h respectively. The speed of the stream is a km/h. If the total time taken by the boat is 15 hours, find the value of ‘a’.

A 1.5
B 3.2
C 4.5
D 8.5
E None of these
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