A cyclist rides from A to B at average spped of 15 km/h and returns back at an average speed of 20km/h.Find the average speed for the entire trip
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Answer:
17.14 km/hr......
Explanation:
Let the distance between A and B is 'x' km
Speed of car from A to B (u) = 15 km/hr
Time (T1) = x/15
Also,
Distance between B and A is 'x' km
Speed of car from B to A (v) = 20 km/he
Time(T2) = x/20
Total Time = T1 + T2
= x/15 + x/20
= 4x + 3x / 60
= 7x/60
Total Distance Covered = x+x = 2x
Average Speed = Total Distance Covered / Total Time Taken
= 2x × 60 / 7x
= 120/7
= 17.14 km/hr.....
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