Question

Suppose you walk from home to the bus stand at 4 km/hr. and immediately return at x km/h. if the average speed is 6 km/h., then x is

Answer 1

first speed. 4km/h
2nd speed. xkm/h
average speed. 6 km/h
B.T.P. [formula; 2xy/(x+y)]
=> 2×4×x/4+x=6
=>8x/4+x=6
=>8x= 6 (4+x)
=>8x-6x= 24
=>2x=24
=>x=24/2=12

(ans) The value of x is 12km/h

Answer 2

Pls tell if there is any mistake.....