Answer:
5 hours
Step-by-step explanation:
The relationship for distance, time, and speed is: [tex]d=st[/tex] , where d is the distance, s is the speed, and t is the time.
We are given the boy's speed is 4 kmph, so s = 4. We also know the distance is 20 km, so d = 20.
Then, rearranging the above formula, we have [tex]t=\frac{d}{s}[/tex] . We plug in the values of d and s into the equation to find t:
[tex]t = \frac{d}{s} =\frac{20}{4} =5[/tex]
Thus, the answer is 5 hours.
Hope this helps!
