A car covers first 100 km of his journey at 50 km/h, next 50 km at 40 km/h and last 75 km in 1. 15h
Find the average speed of the whole journey.
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50km/hr
Step-by-step explanation:
CONSIDERING LAST TIME GIVEN IS 1HR 15 MIN
avg speed = total distance / total time
total dustance = 100+50+75=225km
time taken in first 100km = 100/50= 2hr
time taken in next 50 km = 50/40 = 1hr 15 min
time taken in last 75 km = 1hr 15 min
total time taken = 2hr +1hr 15min +1hr 15min
= 4hr 30min i.e 4.5 hr
avg speed = 225km/4.5hr = 50km/hr
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