Question

1. Starting from a point at a speed of 4 km/hr a
man reaches at a cerain place and returns back
to the point from where he had started journey
on bicycle at the speed of 16 km/hr. His
average speed during the entire journey will
be:​

Answer 1

Answer:

6.4 km/hr

Step-by-step explanation:

Speed =1:4

Time = 1:4

16*1+ 4*4 = 32 km in 5 hours

average speed = 32/5 =6.4 km/hr

Answer 2

Answer:

6.4

Step-by-step explanation:

(Product of speed/sum of speed)

2×(4×16/4+16)

=2×64/20

=6.4 km/hrs