Question

Harish on tour travels first 160 km at 64 km /hr and the next 160 km at 80 km /hr. The average speed of for the first 320 km of the tour is

Answer 1

for first 160 km,

t1= 160/64 hr.

for second 160 km,

t2= 160/80 hr.

now average speed for 320 km,

speed = total distance/ total time

= 320 km/((160/64)+(160/80))hr

=320 /(2.5 + 2)

=320/4.5 km/hr

= 71.11 km/hr