A man walks 6 km at 12 km/h and returns at 10 km/h . Find his average speed.
with full explanation , step by step .
Answers
Answer:
6.85km/h
Step-by-step explanation:
Speed =6km/h
distance =1km
Time =distance/speed=1/6h
Speed =8km/h
Distance =1km
Time =distance/speed=1/8h
Average speed =Total Distance/
total time taken
=1+1+1 1
-- --
6 8
= 2+ 4+3
------
2
=2+ 7
------
24 =2× 24. 48
-----. = --------
7 7
=6.85km/h
Step-by-step explanation:
Search...
joy28
joy28
27.09.2017
Math
Secondary School
answered • expert verified
A man walks 6km to 12 km/h and returns at 10km/h.find his average speed
2
SEE ANSWERS
Log in to add comment
Answer Expert Verified
3.3/5
27
allysia
Ace
967 answers
487.6K people helped
A ------------------------------- B
suppose this is the distance of 6km
from A to B
distance = 6km
speed = 12km/h
time taken = 6 /12
= 0.5 h
from B to A
distance = 6km
speed = 10km/h
time = distance/ speed
= 6/10
= 0.6 h
average speed = total distance covered/ total time taken
= (6 +6) /( 0.5 + 0.6)
= 12 /1.1
= 10.90km/h