4 Subrahmaniyam went to his office at a speed of 6 km/hr and returned back at the speed of 3 km/hr. What is his average speed for the whole trip? (a) 4.5 km/hr (b) 4 km/hr (c) 3.5 km/hr (d) Data insufficien
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Answer :
(a) 4.5 km/hr
Given :
- Subrahmaniyam went to his office at a speed of 6 km/hr and returned back at the speed of 3 km/hr.
To find :
- average speed for the whole trip
Solution :
⇒ Let's find the Average Speed.
- Here, we have to use the following formula for finding the average speed.
→ Average Speed = (a + b)/2
→ Here,
- a = 6 km/hr
- b = 3 km/hr
→ Average Speed = (a + b)/2
= (6 + 3)/2 km/hr
= 9/2 km/hr
= 4.5 km/hr
- Therefore, the average speed for the whole trip is (a) 4.5 km/hr.
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