a body travels a distance of10km with a constant speed of 30km h-1 and then next 40km at a constant speed of 50km h-1.find the average speed for whole the journey
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we know,
time taken = distance/time taken
body moves 10km with speed 30 km/h
time = 10/30 hour
T1 ( Let ) = 1/3
body again, covers 40km with speed 50km/h .
hence, time = 40/50 hour
T2(Let) = 4/5 hour
average speed = total distance/total time
= ( 10 + 40)/( 1/3 + 4/5)
= 50/(17)/15 km/h
= 750/17 km/h
= 44.1 km/h
time taken = distance/time taken
body moves 10km with speed 30 km/h
time = 10/30 hour
T1 ( Let ) = 1/3
body again, covers 40km with speed 50km/h .
hence, time = 40/50 hour
T2(Let) = 4/5 hour
average speed = total distance/total time
= ( 10 + 40)/( 1/3 + 4/5)
= 50/(17)/15 km/h
= 750/17 km/h
= 44.1 km/h
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