Question

A man travels 200 km distance with the speed
of 40 m's and next 50 km with the speed of 10
m's. Find the average speed of man.​

Answer 1

Explanation:

1 m/s= 18/5 km/h

40 m/s= 40*18/5= 144 km/h

10 m/s= 10*18/5= 36 km/h

Average speed= Total distance/Total time taken

=> (200+50)/(200/144+50/36)

=> 250(400/144)

=> 90 km/h

=> 25 m/s

Answer 2

Explanation:

Speed 1= Distance 1/ time 1

time 1 = Distance 1/ Speed 1

t 1 = 200/ 40

t 1 = 5s

Speed 2= Distance 2/ time 2

time 2 = Distance 2/ Speed 2

t 2 = 50/10

t 2 = 5s

total distance = D1 +D2

= 200+50

= 250km

total time= t 1+ t 2

= 5+5

= 10s

Average speed = total distance/total time

= 250/10

therefore average speed= 25m/s

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