Question

Calculate the average speed if a body travels 50 km from A to B and then 40 km from B to C in total time of 3 hours.​

Answer 1

Answer:

1-

Suppose the total distance is 'S'.

According to question,

Body covers first half of its total distance with speed V1 .Let the time be t1.

Using ,Speed=Distance /Time

V1=(S/2)/t1=S/2t1

t1=S/ 2 V1

and remaining distance with speed V2. let the time be t2.

V2=(S/2) /t2=S/ 2t2

t2=S/2 V2

Now the average speed is given by the relation,

Average speed=Total distance covered / Total time taken

=S /(t1 + t2)

=S/ (S/ 2 V1 +S/2 V2)

=2V1V2 /(V1+V2)

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Answer 2

Answer:

average speed = total distance covered / total time taken

= 50km + 40km / 3hrs

= 90km / 3hrs

= 30km/hr

average speed = 30km/hr

hope it helps you