Question

EXERCISES
1. A boy while driving to his school covers at the average speed of 15 km/h. On
his return trip along the same route, covers at the average speed of 25 km/h due to
less traffic. What is his average speed for the whole trip?
(18.75 km/h)
2. A motor boat in Loktak lake starting
from​

Answer 1

Answer:

18.75

Explanation:

Below pic show steps how to get this answer

shortcut eqn only applicable when distance is same

.

.

hope it help u

Answer 2

Answer:

18.75

Explanation:

distance=x

T1=x/15

T2=x/25

avg speed = total distance/ total time

= x+x/(x/15+x/25)

=75/4

=18.75