Question

A man complete s 30 km oof a journey at6 km\h and the remaking 40 km of journey in 5 h then his average speed of the whole journey is

Answer 1

average speed = total distance travelled /  total time duration
   
t1 = 30 / 6 = 5 hours
t2 = 40 / 5 = 8 hours
t1+t2 = 13 hours
total distance = 30+40 = 70 km

average speed = 70 / 13 = 70/13 = 5.38 kmph

Answer 2

average speed =
 total distance/  total time
    
T1 =
30 / 6 =
 5 hours
T2 =
 40 / 5 =
 8 hours
T1+T2 =
13 hours 
total distance =
30+40 =
70 km

average speed
= 70 / 13 =
70/13 =
 5.38 km/hr
hope this helps