Question

A car moves 20 km/h for 5 hrs and 10 km/h for 15 hrs. Find its Average Velocity​

Answer 1

Answer:

Solution:

(ii) 25 km

Speed (s1) = 40km/h

Time (t1) = 15 mins = (15/60) hr

Distance d1 = (s1 × t1) = 40 × (15/60) = 10 km

Speed (s2) = 60 km/h

Time (t2) = 15 min = (15/60) hour

Distance (d2) = (s2 × t2) = 60 × (15/60) = 15 km

Total distance (d) = (d1 + d2) = 10 km + 15 km = 25 km

Answer 2

Answer:

25

Explanation:

Speed of car in first 15 minutes = 40 km/h

Distance covered = speed × Time taken

60 minutes = 1 hour

15 minutes =  

60

15

​

 hour

Distance covered = 240×  

60

15

​

=10km

Speed of car in next 15 minutes = 60 km/h

Distance covered = 60×  

60

15

​

=15km

∴ Total distance covered = (10+15)km = 25 km

∴ 25 km is correct