1. The respective ratio between the time taken by a boat to travel the same distance downstream in stream A and that in stream B is 8 : 7. The speed of the boat is 12 km/h and the speed of stream A is half the speed of stream B. What is the speed of stream B ? (in km/h)
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- By: anil on 05 May 2019 01.29 amLet speed of stream B = $$2x$$ km/h and speed of stream A = $$x$$ km/h Speed of stream = $$12$$ km/h Acc to ques, => $$frac{frac{1}{12 + x}}{frac{1}{12 + 2x}} = frac{8}{7}$$ => $$frac{12 + 2x}{12 + x} = frac{8}{7}$$ => $$84 + 14x = 96 + 8x$$ => $$14x - 8x = 96 - 84$$ => $$x = frac{12}{6} = 2$$ $$ herefore$$ Speed of stream B = $$2 imes 2 = 4$$ km/h
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