Question

A cyclist pedals from his house to his college at a speed of 10 KMPH and back from the college to his house at 15 KMPH. Find the average speed.

Answer 1

Answer:

Average speed = (10 + 15) /2 = 25/2 = 12.5 KMPH

Answer 2

Step-by-step explanation:

Given A cyclist pedals from his house to his college at a speed of 10 KMPH and back from the college to his house at 15 KMPH. Find the average speed.

• Let the distance from house to college be m km
• Let the time taken from house to college be t1
• So we have time taken from house to college at a speed of 15 km/hr So m = 10 x t1-------1            
•      m = 15 x t2-------2
• So from 1 and 2                
•  10 t1 = 15 t2                    
•  t1 = 15 / 10 t2
• So we get average speed = total distance / total time                                  = 10 t1 + 15 t2 / t1 + t2                                  
• = 10 x 15 / 10 t2 + 15 t2 / 15/10 t2 + t2                              
•     = 30 t2 / 15 t2 + 10 t2 / 10                                
•         = 300 t2 / 25 t2                                  
•           = 12 km / hr

Therefore the average speed is 12 km/hr

Reference link will be

https://brainly.in/question/18486682