Question

(iii) Prove that, in an infinite G.P. whose common ratio r has its
absolute value less than one, the ratio of any term to the sum of
all the succeeding terms is 1-r/r

Answer 1

Answer:The relative velocity of train with respect to bird is 10+5=15m/s

Hence in a frame of reference in which bird is at rest the train is moving with velocity 5m/s

The train is 120m long hence time taken for train to pass (from where bird is) end to end is

speed=distance/time

time=distance/speed

time=120/15

time=8 sec

Hence bird takes 8 sec to pass the train

Step-by-step explanation: