Question

A train travels the first 15 km at a uniform speed of 30 km/h, and the next 75 km at a uniform speed of 50 km/h. calculate the average speed for the entire train journey

Answer 1

Hello friend!!!!!!!!!??

Thanks for the question????
Given:
Distance= D

D1 = 15
D2 = 75

Speed= S

S1 = 30
S2 = 50

We have the Total distance= 15 + 75
= 90km.

Now, we have to find the total time.

So to find the total time.we divide it into two parts. T1 and T2

hence,

T1 = D1/S1

T1 = 15/30

T1 = 0.5 hours.

Similarly,

T2 = D2/S2

T2 = 75/50

T2 = 1.5 hours

hence total time= T1 + T2 = 0.5+1.5
= 2 hours.

Now easily we can find the average speed.

By using the formula

Average Speed = Total Distance/ Total Time

Average speed= 90/2

= 45 km/h

Therefore the average speed= 45 km/h.

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...........I hope this will helps you............