Question

A car travels 30 km at a uniform speed of 40km/hr and the next 30km at a uniform speed of 20km/hr. Find its average speed?​

Answer 1

Answer:

26.66km

Step-by-step explanation:

average speed = total distance/total time

first 30km with a speed of 40km/hr so time=distance/speed

t=30/40=45 mints

similarly next 30 km with a speed of 20 km/hr

t2= 30/20= 1hr 30 mints

average speed =30+30/9/4 (45mints=3/4 and 1 hr 30 mints = 3/2 so 3/4+3/2=9/4)

average speed =60×4/9=80/3=26.66km