Question

Pallavi travelled the first 48 kms at a speed of 24km/h and the last 42km at some speed. If her average speed for the whole journey is 10m/s. what is the speed at which she travelled the last 42km

Answer 1

Answer:

0.5 kmph

Step-by-step explanation:

Let the time taken for her to travel 48 km be t1

Let the time taken for her to travel 42 km be t2

given. Average Speed = 10 mps

= 10*18/5 kmph

= 36 kmph

Average Speed=Total Distance/Total Time

36= 48+42/t1+t2

= 90/2+t2 [t1= 48/24= 2hrs]

2(2+t2)=5

4+2t2 =5

t2=1/2 hrs