Ans. Suppose the speed of boat in still water is x km/h and speed of stream is y km/h
Speedof boat in downstream = (x + y) km/h x+ y = 32 ?(i)
Speed of boat in upstream = (x ? y) km/h
x ? y = 28 ?(ii)
Add. Eqs. (i) and (ii), we get 2x = 60
x = 30 km/h
Ans. CP of mixture = {(40*3+60*2)/2+3} = 48 SP of the mixture = 1.1 48 =52.8
?apart? is incorrect after ?to drain water?
?has? is incorrectly used since the sentence is in past tense. Moreover, the subject is cities, which is plural.
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