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Let speed of the boat in still water be ‘3x’ km/h. Speed of the boat in upstream = 3x ÷ 3 = ‘x’ km/h Speed of the stream = 3x – x = ‘2x’ km/h Speed of the boat in downstream = 3x + 2x = ‘5x’ km/h ATQ; (20/20) × 60 = 5x So, 5x = 60 Or, x = 12 So, speed of the boat in still water = 3 × 12 = 36 km/h
Given that x = 80, y = -35 and z = -45, Determine the value of [(x³ + y³ + z³)/10³]
If x, y and z are real numbers such that (x-5)2+(y-7)2+(z-9)2= 0 then (x+y+z) is equal to
If sin 28° = 15/17 , then tan 62° = ?
If 3y-3/y=18 then find the value of y² +1/y²
If (Ax + By - Cz) 2 = 4x 2 + 3y 2 + 2z 2 + 4√3xy - 2√6yz - 4√2xz, then find the value of A
If a + b + c = 12 and ab + bc + ca = 50, then find the value of a2 + b2 + c2.