A bus is travelling the first 1/3 rd distance at a speed of 10 km/h. The next 1/4 at 20 km/h and the remaining at 40 km/h. Find the average speed of the bus?
Share
A bus is travelling the first 1/3 rd distance at a speed of 10 km/h. The next 1/4 at 20 km/h and the remaining at 40 km/h. Find the average speed of the bus?
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Average speed = Total distance / Time
= S / (t1 + t2)
= S / [(S/(3 * 10)) + (S/(4 * 20)) + (5S/(12 * 40))]
...….....[∵ Time = Distance / Speed]
= 1 / (1/30 + 1/80 + 5/480)
= 17.7 kmph
In two significant figures average speed will be 18 kmph