Question

1) Abdul, while driving to school, computes the average speed for his trip to be 20 km h–1 On his return trip along the same route, there is less traffic and the average speed is 40 km h–1 What is the average speed for Abdul’s trip?

Answer 1

Step-by-step explanation:

The average speed for the return trip is:

v = 2L/(t1+t2)

v average speed

L one way distance

t1 time taken to drive to school

t2 time taken to drive back home

Now:

t1 = L/20

t2 = L/40

Hence:

V = 2L/(L/20+L/40) = 2/(1/20+1/40) = 26.7 km/hr.

Average speed is about 27 km/hr.

Answer 2

Step-by-step explanation:

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