Question

A body travels a distance of 10 km with a constant
speed of 30 km h-1 and then the next 40 km at a
constant speed of 50 km h-Find the average speed
for the whole journey.​

Answer 1

ANSWER IS :

10 km at 30 kph takes 20 minutes

10 km at 30 kph takes 20 minutes40 km at 50 kph takes 48 minutes

10 km at 30 kph takes 20 minutes40 km at 50 kph takes 48 minutesTherefore

10 km at 30 kph takes 20 minutes40 km at 50 kph takes 48 minutesTherefore50 km has taken 68 minutes

10 km at 30 kph takes 20 minutes40 km at 50 kph takes 48 minutesTherefore50 km has taken 68 minutesAverage speed is 50/68 km per minute = 0.7353 km per minute

10 km at 30 kph takes 20 minutes40 km at 50 kph takes 48 minutesTherefore50 km has taken 68 minutesAverage speed is 50/68 km per minute = 0.7353 km per minuteOr multiply by 60 minutes to get 44.12 kph