# A car moves at 80 km/hr in the first half of the total time of —— 40km/hr :

A car moves at 80 km/hr in the first half of the total time of —— 40km/hr in the later half. Its average speed is

(a) 30 km/hr

(b) 40 km/hr

(c) 60 km/hr

(d) 120 km/hr

**Answer: (c) 60 km/hr**

**Explanation:-**

**Formula-
Average speed = total distance/total time**

**Given-**

Speed (S 1) = 80 t/2 and speed (S 2) = 40 t/2

Then, S 1 = 40 t and S 2 = 20 t

Total distance = S 1 + S 2

= 40 t + 20 t

= 60 t

Total time = t/2 + t/2 = t

So, average speed = 60 t/t

= 60 km/hr

Hence, the correct answer is option (c) 60 km/hr.