Roshni drove for two hours at a speed of 40 km/h and for one hour at a speed of 70 km/h. What was her average speed for the whole journey.
This is of science.
Topic = Motion and Time.
Please tell me the answer of this question.
Answers
Answered by
5
Answer:
total distance = (40×2) + (70×1) km
= 80+70 km
= 150 km
total time travelled = 2+1 h = 3h
average speed = 150/3 km/h
= 50 km/h :ANSWER
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Answered by
6
Answer:
50 km/h
Explanation:
in first case :-
speed:-40 km/h
time :-2 hours
in second case:-
speed =70km/h
time=1 hours
now,
average speed = total distance /total time
total distance = 40×2+70×1 (given)
=80+70
=150 km
total time=3 hours
average speed = total distance /total time
= 150÷3
average speed = 50 km/h
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