A man walks at 6 m/sec and reaches his destination in 20 minutes. A woman covers the same distance in 1.2 hours. What is the speed of the woman (in km/h)?

A man walks at 6 m/sec and reaches his destination in 20 minutes.

Speed of man = 6 m/sec

time taken to reach the destination = 20 minutes 

= $$20\times60$$ seconds [1 minute = 60 seconds]

= 1200 seconds

Distance covered by the man = $$speed\times\ time$$

= $$6\times1200$$

 = 7200 m

A woman covers the same distance in 1.2 hours.

Distance = 7200 m

= 7.2 km [1km = 1000m]

Speed of the woman = $$\frac{distance}{time}$$

= $$\frac{7.2}{1.2}$$

= 6 km/h