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Let the speed of stream be ‘x’ km/hr. So, speed of boat in still water = 5 × x = 5x km/hr Downstream speed of boat = 5x + x = 6x km/hr According to question; 6x = 126/7 = 18 Or, x = 3 Upstream speed of the boat = 5x – x = 4x = 4 × 3 = 12 km/hr Required time taken = 108/12 = 9 hours
Length of each side of a rhombus is 13 cm and one of the diagonal is 24 cm. What is the area (in cm2) of the rhombus?
If (a + b + c) = 9, find (a – 4)3 + (b – 2)3 + ( c – 3)3 – 3(a – 4 ) (b – 2 ) (c &n...
if a2 + b2 + c2 = 2(3a -5b -6c)-70 , then a-b-c = ?
Find the value of 3/4 cot² 30° + cos² 30°-3cosec²60° + tan² 60°.
If x + y + z = 4, xyz = 6 & x2 + y2 + z2 = 8 then find the value of x3 + y3 + z3.
A train takes 25 seconds more to cross a 750 metres long platform than it does to cross a 350 metres long bridge. If the time tak...
3x +3y =10 and 3x+y =5 then find the value of 3x-y +3y-x.
