ATQ, Speed of the boat downstream = (45/90)×60 = 30 km/h Let the speed of the boat in still water = 5x km/h Speed of stream = 3x km/h Speed of the boat downstream = 5x+3x = 8x km/h 30 = 8x x = 30/8 = 3.75 Speed of the boat in still water = 5×3.75 = 18.75 km/h Speed of the stream = 3×3.75 = 11.25 km/h Speed of the boat upstream = 18.75−11.25 = 7.5 km/h Time taken by the boat to cover the distance of 15 km upstream = (15/7.5) × 60 = 120 minutes
If x ,y,z are three integers such that x +y = 8,y +z =13 and z +x =17,then the value of x2 /yz is:
If x4 + x - 4 = 47 then find the value of (x + x-1).
If x, y and z are real numbers such that (x-5)2+(y-8)2+(z-12)2= 0 then (x+y+z) is equal to
If a + (1/a) = 2, then find the value of (a5 + a3 + 6)/(7a – 5).
If x = 15
find x 5 - 16 x 4 + 16 x 3 - 16 x 2 + 16 x - 16 = ?
If x = 8.15, y = 9.06 and z = –17.21, then the value of x³ + y³ + z³ – 3xyz is:
If 8x3 - 125y3 = (2x - Ay) X (Bx2 + 25y2 + Cxy), then find the value of 3 X (2A + 6B) - 2C.
The speed of a car is 25% more than that of a bike. Both of them start from a same point. After travelling for 4 hours, the speed of the bike is increas...
If a + b + c = 12 and ab + bc + ca = 50, then find the value of a2 + b2 + c2.
