Question

a boy goes to school at 4.5 km per hour and returns at a speed of 7.5 km per hour if he takes 144 minutes in all find the distance from h village to school​

Answer 1

Answer:6 km

Explanation:Let the required distance be x km.

Then,

\frac{x}{3}+\frac{x}{2} = 5

=> \frac{2x+3x}{6} = 5

=> 5x = 6 \times 5

\therefore x = \frac{6\times 5}{5} = 6 km.

Hence option [D] is the right answer.

Answer 2

Answer: 9 km

Explanation:

Let the distance be x......

taking distance as x

time=d/st=t1+t2

time=(x/4.5)+(x/7.5)= 2hrs 24 mins

solve it

giving answer 9 km