Step-by-step explanation:
based on the answer options we are looking for km/h as speed norm here.
we got km at the bottom, so we need to bring the given times to hours.
my understanding of the given information is that the given times are accumulated numbers. that means the total travel time is 14 minutes.
the average speed is simply the sum of all distances divided by the sum of all times.
10 + 18 + 7 + 15 = 50 km
14 minutes = 14/60 hours = 7/30 hours
the average speed is then
50 / 7/30 = 50/1 / 7/30 = 50×30 / (7×1) = 1500/7 =
= 214.2857143... km/h
answer c) 214.28 km/h is correct.
