A car travels 50 km in first one hour and 40 km in next 30 minutes. Find its average speed for the
whole journey.
(A) 60 km/h
(B) 65 km/h
(C) 45 km/h
(D) 90 km/h
Space for Rough Work
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Answer:
(B) 65 km/h
Step-by-step explanation:
1st hour - 50 km
1st half of the 2nd hour - 40 km
if we assume the car travel at the same speed and cover the same distance in the next 30 minutes. Then the car will travel 80 km in the 2nd hour.
50 + 40(2*) = 130
130/2 = 65
* there are '2' 30 minutes in an hour
I hope this helps
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