Question

If a boy walks to his chool at a speed of 4 km/hr, he reaches the school 10 minutes before
school time. If he walks at 3 m/hr. he reaches the school 10 minutes late. Find the distance
between his house and the school.​

Answer 1

Answer:

x = 20 km

Step-by-step explanation:

Let time taken be t (for reaching on time).

Let distance between school and house be x.

s1 = 4 km/hr  s2 = 3 km/hr

Then,

Distance = speed X time

4x = t - 10  ---> (1)

3x = t +10  ---> (2)

Adding (1) and (2),

7x = 2t

=>  t = 7x / 2

Substituting t in (1),

4x = 7x/2 - 10

    = (7x - 20)/2

8x = 7x - 20

x = -20 km

But distance cannot be negative, therefore

x = 20 km

Hope it is useful...

Answer 2

Answer:

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