Question

a train travels at a speed of 60km/hr for 0.52,30km/hr for next 0.24hr and them at 70km/hr for next 0.71 hr.wgar is the average speed...

Answer 1

Find the total distance of the trip; (dist = speed * time)
d = (60*.52) + (30*.24) + (70*.71)
d = 31.2 + 7.2 + 49.7

d = 88.1 km
:
Find the total time for the trip
t = .52 + .24 + .71
t = 1.47 hrs
:
Find the av speed (a = d/t)
a =  88.1/1.47
a = 59.932 ~ 60 km/hr av speed for the trip

Hope This Helps :)