Question

Question 11

Meenakshee cycles to her school at an average speed of 12 km/h and takes 20 minutes to reach her school. If she wants to reach her school in 12 minutes, her average speed should be
$\left(a\right)\frac{20}{3}km/h$
(b)16 km/h
(c)20 km/h
(d) 15 km/h

Answer 1

Given, speed of cycle =12 km/h
Time taken by Meenakshee through cycle =20 min
Then, total distance cover $=\frac{12\times 20}{60}=4km[\because$ distance =time $\times$ speed]
If Meenakshee want to reach her school in 12 min, then her cycle speed should be $\frac{\frac{4}{12}}{60}$i.e. 20 km/h. $(\because speed=\frac{distance}{time})$
Hence, option (c)is correct.