self Maths Puzzle

two boats go downstream from point x to point y.the faster boat covers the distance from x to y 1.5 times as fast as the slower boat.it sis known that for every hour the slower boat lags behind the faster boat by 8 km.however,if they go upstream,then the faster boatcovers the distance from y tox in half thetime as the slower boat.find the speed of faster boat in still water.

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self Other Question

The current erection cost of a structure is Rs. 13,200. If the labour wages per day increase by 1/5 of the current wages and the working hours decrease by 1/24 of the current period, then the new cost of erection in Rs. is
option
(A) 16,500
(B) 15,180
(C) 11,000
(D) 10,120
the distance between veranasi and lucknow is 220km.two bus start from these towns towards each other.they can meet halfway if the first bus leaves 2 hrs earlier then the second.if they start simultaneously,they will meet in 4 hrs.find the speed of the buses.