Question

how to take out average speed of a girl who takes 20 min to go to school which is 3 km away and she takes 30 min to return .​

Answer 1

Answer:

Total distance travelled = 3+3 =6 km

Total time taken = 20+30 = 50 min

Average speed = Total distance travelled/ Total time taken

6/50 = 8.3 km/min

PLEASE MARK IT BRAINLIST QUESTION

Answer 2

Step-by-step explanation:

total distance= 3+3= 6km.

total time taken= 20+30= 50min= 5/6hour.

avg. speed =

$\frac{total \: distance \: covered}{total \: time \: taken}$

=

$\frac{6}{5 \div 6 } = \frac{6 \times 6}{5} = \frac{36}{5}$

so, average speed will be 36/5 km/hr.