Question
The speed of a boat in still water is 32km/hr and the
speed of the current is 8km/hr. It takes a total of 15hours to row to upstream from Point A to B and downstream from Point B to C. If the distance between A to C is two-fifth the distance between B and C then what is the distance between B and C? (Where BC < AB)Solution
Let the distance from B to C be xkm ∴ A to C = 2x/5 km Upstream speed = 32 – 8 = 24 km/hr Downstream speed = 32 + 8 = 40km/hr Now, 7x/(5 × 24) + x/40 = 15 7x/120 + x/40 = 15 (7x + 3x)/120 = 15 x = 180 km
What will be the value of expression if the signs β(+)β and β(Γ)β are interchanged?
63 + 7 Γ· 21 Γ 14 β 24 Γ· 6
...If all the alphabets of alphabetical series are numbered as 26-1 from A-Z then what is the sum of the numbers of letters of the word β PARENT β?Β
Which two signs should be interchanged in the following equation to make it correct:
640 Γ· 80 + 6 Γ 20 β 10 = 58