Answer:

$\frac{9}{4}$ Km

Explanation:

Let, the distance the boy covers by walking is x km.
Then the distance the boy covers by cycling = (6 —x) km.
According to the question,$\frac{6-x}{18}+\frac{x}{6} = \frac{35}{60}$

x = $\frac{9}{4}$ Km

Answer:

8

Explanation:

Let, commerce graduates and science graduates is 2:: and 5x respectively
According to the question, $\frac{2x+2}{5x}=\frac{1}{2}$
x = 4.
Commerce graduates will be = 2x
=2×4
= 8.

Answer:

12 Days

Explanation:

A can dig in l day $\frac{1}{30}$ of the pond

B can dig in 1 day $\frac{1}{20}$ of the pond

A & B together can dig in 1 day $\frac{1}{30}$ +$\frac{1}{20}$ =$\frac{1}{12}$ of the pond.
A & B together can dig the pond in = $\frac{12×1}{1}$= 12 days.

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