the water in a river flows at a speed of 1.5 km per hour and a boatman who can row is boat at a speed of 2.5 kilometre per hour in

Question

the water in a river flows at a speed of 1.5 km per hour and a boatman who can row is boat at a speed of 2.5 kilometre per hour in still water takes 7.2 hours to go how distance options and then return to the starting point the total distance covered by the boatman is

Eva · Answer

Answer:   Let distance be x km    Speed downstream = 5+2 = 7 km /hr.    Speed upstream = 5-2 = 3 km/hr.    So 3x−7x=2    7x−3x=2×21    4x = 42    x=442=10.5 km/h

Samantha

Population of village is 2700 . If 1070 are men and 915 are women . Find the number of children ?

The HCF of x² + 3 X + 2 and x²+ 5 x + 6 is X + a then value of a will be

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