Question

Lily takes 3 hours to travel from place a to place b at the rate of 60km/h. she takes 2hrs to travel from place b to c with 50% increased speed. find the average speed from place a to c

Answer 1

Answer:

The average speed from place a to c is 72km/h.

Explanation:

Between A to B,

Given speed = 60km/h

And, time = 3 hours

Therefore, Distance = Speed × Time

= 60 × 3 = 180 kilometer.

Again,

Between B to C,

Given speed = 50 % increased speed

Therefore, speed = 60 + 50 % of 60

= 60 + 50 / 100 × 60

= 60 + 30 = 90km/h

Given time = 2 hours

Therefore, Distance = Speed × Time

= 90 × 2 = 180 kilometer.

Between A to C,

Average Speed = Total Distance / Total Time

= 180 + 180 / 3 + 2

= 360 / 5 = 72km/h(answer).

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