Question

1. A boy covers a distance of 20 km in 2, 1/2hours, partly on foot at the rate of
5 km/h and partly on bicycle at the rate of 10 km/h. Find the distance covered
on foot.​

Answer 1

Answer:

5km

Step-by-step explanation:

Let's consider the distance covered on foot as d1 and that on cycle as d2.

Hence, distance = d1+d2 = s1*t1 + s2*t2

20 = 5*t1+10*(2.5-t1)

20 = 5*t1+25-10t1

20-25 = -5*t1

-5 = - 5*t1

t1 = 1

d1 = s1*t1 = 5*1 = 5km