Question

Riya cycles to her school at an average speed of 12 km/hr. It takes her 20 minutes to reach her school. At what speed should she ride her bicycle if she wants to reach her school within 15 minutes?​

Answer 1

Answer:

She should ride her bicycle at speed of 16km/h if she wants to reach her school within 15 minutes.

Step-by-step explanation:

Here in this question, we have been given that Riya rides her bicycle at the speed of 12km/hr to reach her school in 20 minutes.

We have been asked to find the speed at which she should tide her bicycle to reach her school in 15 minutes.

We know that, Speed=distance/time

In the first case:

Distance=speed×time

            =12×$\frac{20}{60}$

              =4 km

In the second case, the distance remains the same and the time decreases to 15 minutes.

speed=4×$\frac{60}{15}$

         =16km/hr

Hence she should ride her bicycle at the speed of 16km/hr in order to reach her school in 15 minutes.