Question

A train went 300 miles from X to Y at an average speed of 80 mph. At what speed did.it travel on the way back it its average speed for the whole trip was 100 mph?

a 120 mph
b 125 mph
c 133.33 mph
d 137.5 mph​

Answer 1

Answer:

133.33

Step-by-step explanation:

Average speed for same distance is given by (2*v1*v2)/(v1+v2)

2*80*v2/80+v2=100

160v2=8000+100v2

60 v2=8000

3v2=400

v2=400/3

Hope dis helps

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Answer 2

Answer:

b . 125mph

Step-by-step explanation:

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