Example 3 Krishna covers a certain
distance by car at a speed of 35 km/h
and he returns back to the starting point
riding on a scooter with a speed of 25
km/h. Find the average speed for the
whole journey.
(a) 29.16 km/h
(b) 26.19 km/h
(c) 25 km/h
(d) 24.5 km/
Answers
Answer:
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Rani covers a certain distance by car driving at 5 km/h and returns the starting point riding on a scooter at 2 km/h. Find her average speed for the whole journey.
36/7 km/h
26/7 km/h
56/7 km/h
76/7 km/h
Correct Option: B
According to the formula,
Average speed = 2AB/(A + B)
Here, A = 5 km/h, and B = 2 km/h
∴ Required average speed = (2 x 5 x 2)/7 = 20/7
= 26/7 km/h
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Answer:
To speed 35kmph
Fro speed 25kmph
Avgspeed =2*35*25/35+25
Avgspeed=29.16kmph
Step-by-step explanation: