a motorcyclist drives from A to B with a uniform speed of 20 km per hour and return back with a speed of 15 km /h find his average speed
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Step-by-step explanation: A motorcyclist drives from place A to B with a uniform speed of
A motorcyclist drives from A to B with a uniform speed of 30 km/h and returns with a speed of 20 km/h.
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Answer:
17*1/7 (17 whole 1 upon 7)
Step-by-step explanation:
Let the distance between A and B be x
Time taken from A to B, t₁ = ˣ⁄₂₀
Time taken from B to A, t₂ = ˣ⁄₁₅
Total time = t₁ + t₂ = ˣ⁄₂₀ + ˣ⁄₁₅ = ⁷ˣ⁄₆₀
Average speed = total distance/total time
= (x+x)/(7x/60)
= 2x/(7x/60)
= 120/7
= 17*1/7
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