Question
A boat takes 12 hours longer to
cover 378 km upstream than it does to cover the same distance downstream. The speed of the stream is 12 km/h. What is the distance the boat travels downstream in 13 hours?Solution
ATQ, Let the speed of boat in still water= 'd' Kmph 378/(d-12) – 378/(d+12)=12 378 (d+12-d+12)=12(d -144) 378 (24)=12(d -144) 756= d -144 d =900 d=30 Downstream speed of boat = 30+12 = 42 Kmph Required answer = 42×13 = 546 Km
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∆ABC and ∆DEF are similar and their areas are respectively 16 cm2 and 64 cm 2 . If EF = 6 cm BC is?
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