Question
βAβ alone can complete a work in 20 hours. βAβ
started the work alone and left after working on it for 15 hours. If βBβ completed the rest of the work in 20 hours then find the time taken by βAβ and βBβ together to complete the whole work.Solution
Let the total work = 240 units Then, efficiency of βAβ = (240/20) = 12 units/hour Work completed by βAβ alone in 15 hours = 12 Γ 15 = 180 units Remaining work = 240 β 180 = 60 units So, efficiency of βBβ = 60/20 = 3 units/hour Therefore, combined efficiency of βAβ and βBβ = 3 + 12 = 15 units/hour So, time taken by βAβ and βBβ together to complete the work = (240/15) = 16 hours
A regular polygon has an interior angle of 144Β°. How many sides does the polygon have?
Find the area of triangle having sides in the ratio 3:5:7 & the perimeter of the triangle is 60 cm
At the centre of a circle of 20 cm radius, the angle made by an arc of 24(4/9) cm length is
The 2nd approximation to a root of the equation x2-x-1-0 in the interval (1, 2) by Bisection method will be:
Find the area of triangle having sides 3m, 4m, and 5m.
What will be circumradius of an equilateral triangle of side 11 cm?
A solid cylinder has radius of base 14 cm and height 15 cm. 4 identical cylinders are cut from each base as shown in the given figure. Height of small c...
The volume (in cu.cm.) of a right circular cylinder with radius 1 cm and height 2 cm on is: (Take π = 22/7)
Find the area of triangle having sides 5 m, 6 m, and 9 m.