Question

A man travelled of 30 km at the speed of 5km/h, another distance of 24km at 2km/h and further 30 km at speed of 3km/h, what is the average speed of the total journey

Answer 1

average speed =Total distance/Total time
given distance 1=30km, speed 1=5 km per hour
given distance 2=24km, speed 2 =2km per hour
given distance 3=30km, speed 3=3km per hour

therefore t1,t2,t3 will be d1*s1, d2*s2 , d3 *s3 respectively

therefore total distance / total time = (30+24+30)km/t1+t2+t3
=84km/(150+48+90) hour
=84/288 km per hour
= 7/24 km per hour=0.291... km per hour(answer)
hope I have helped u!