Question

A car travels 60 km at 30 km/hr and a further 180 km at 160km find the total time taken and the average speed for the whole journey

Answer 1

Answer: total time taken is 14/19

Average speed is 190km/hr

Step-by-step explanation:

Average speed = total distance/total time taken

Time taken = total distance / speed

Time taken = 60+80/30+160

140/190

14/19

Average speed = 140/(14/19)

(140*19)/14

10*19

190km/hr

Answer 2

Answer:

Time=3 hrs 7 mins 30sec / 3.125 hrs

Avg speed=76.8 km/hr

Step-by-step explanation:

speed=distance/time

time=distance/speed

part I

speed1=30km/hr         distance1=60km

time1=60/30=2hrs

part II

speed2=160km/hr       distance=180km

time2=180/160=3.125hrs (or) 1hr 7 mins 30 sec

total time taken=time1+time2= 2+1.125=3.125hrs

Average speed=total distance covered/total time taken

                         =(60km+180km)/3.125hrs

                         =240/3.125=    76.8km/hr