Question

a car travels from A to B with a speed of 30km/hr and returns back to A with a speed of 50km/hr .Find the distance and average speed of car

Answer 1

LCM of 30 and 50 is 150
so assume distance from A to B is 150.
time taken from A to B: 150/30=5 hr
time taken from B to A:150/50=3 hr
total distance traveeled=150+150=300km
total time taken=5+3=8hr
aver. speed: 300/8=37.5km/hr.