Amirah runs at an average speed of 5 km/h for 1/5h before walking for 1/2h at a certain average speed. If she travels a total distance of 2km, calculate her average walking speed.
Answers
Answered by
1
Answer:
20/7 km/hr
Step-by-step explanation:
Initial velocity = 5kmph
Time travelled with this velocity =1/5 h
Therefore, Distance = 5 x 1/5
= 1km
Total distance = 2 km
So, remaining= 1 km
Time taken to travel this dis.= 1/2 h
Therefore, next velocity= 1÷1/2
= 2kmph
Finally, avg. velocity = 2.v1.v2/v1+v2
= 20/7
Ans. 20/7 kmph
Similar questions