Question

A train moves at a constant speed of 120 km/h for one kilometre and at 40 kmph for the next one kilometre. What is the average speed of the train

Answer 1

Answer:

given speed for 1km= 120 km/hr

speed for 2nd km = 40km/ hr

s=d/t

120=1/t

40=1/t

t1=1/120

t2=1/40

speed avg = 1+1 /1/120/1/40

2/160/4800

9600/160

=60km/hr