Question

3. I walk for x hours at 4 km/h and for 2x hours at 3 km/h
here,
if I go 20 km altogether, find x​

Answer 1

Step-by-step explanation:

$dista \: ce \: covered \: at \: speed \: 4km {h}^{ - 1} = 4x \\ distance \:covered \: at \: speed \: 3km {h}^{ - 1} = 6x$

$given \\ total \: distnce \: = 20km \\ so \: 6x + 4x = 20 = > 10x = 20 = > x = 2$

Answer 2

Answer:

x=2

Step-by-step explanation:

at first : time= x hours

            speed = 4 km/h

        so, distance = time * speed = 4x

then I walk for : time= 2x hours

            speed = 3 km/h

        so, distance = time * speed = 6x

so, total distance = 4x + 6x = 10x

given 10x =20

=> x = 20/10 =2