Question
A boat running downstream covers a distance of 40 km in
2 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water isSolution
Let the speed of boat in still water be a km/hr and that of stream be b km/hr. Therefore, 40/(a + b)= 2 ⇒ a + b = 20 ………..(i) 40/(a – b)= 5 ⇒ a + b = 8 ………..(ii) On adding, eq (i) and (ii) ⇒ 2a = 28 km/hr ⇒ a = 14 km/hr
given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow...
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Statements:Â Â Â Â Â Â Â Â Some red are yellow.
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    ...
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           All blues are greens.
           Some greens are n...
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All car are bus.
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Some train are bike.
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