Durga walk $5 km$ from her home to school in $60$ minutes, then bicycles back to home along the same route at $15 km$ per hour. Her sister Smriti makes the same round trip, but does so at half of Durg’s average speed. How much time does Smriti spend on her round trip ?

Instead of dividing $391$ cookies among $3$ children $A, B, C$ in the ratio $\frac{1}{5}:\frac{1}{4}:\frac{1}{8}$, it was divided into the ratio $5:4:8$. Who gains the most and how many?

Walking at $\frac{3}{4}$ of his usual speed, a man reaches his office $20$ minutes late. Then his usual time for walking to his office is:

The perimeter of a certain isosceles right triangle is $10+10\sqrt{2} \mathrm{cm}$. What is the length of the hypotenuse of the triangle?

Dhiru can dig$\frac{1}{a}$ of a field in $20$ hours. What fraction of the same field can Kaku dig in $20$ hours if the two of them can dig the field in $60$ hours, working together at their respective rates?

Three numbers are such that their sum is $50$. Product is $3750$ and the sum of their reciprocals is $\frac{31}{150}$. Find the sum of the squares of the three numbers.

In the following question, a sentence has been given in Active / Passive voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive / Active voice.

Karnataka grows coffee.