Shruti cycles to her school at an average speed of 18 km/h. It takes her 30 minutes to reach her school. If she wants to reach her school in 20 minutes, what should be her average speed?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

If Shruti wants to reach her school early, she has to increase her speed. Thus it is a case of inverse variation.

Writing the numbers in the form of table, we have

Speed (in km/h)

18

x

Time (in min)

30

20

Now in case of inverse variation, the product of quantities will remain same. Therefore

 

Hence, Shruti has to increase her speed to 27 km/h.

Answered by  | 4th Jun, 2014, 03:23: PM