Question

a man covers a distance of 144 km at the speed of 36 km per hour and another through 256 kilometre at the speed of 64 km per hour find his average speed for the whole journey​

Answer 1

Answer:

4 km

Step-by-step explanation:

First distance = 144km

At speed = 36km

Second distance = 256km

At a speed = 64km

Total distance = 144+256 km

= 400 km

Total speed. = 36+64 km

= 100

Average Speed = Total distance/ total speed

= 400/100 km

= 4km

Answer 2

Answer:

1st case:

distance(s) =144km

speed=36km/h

time=?

time=distance/speed

=144/36

=4hr

2nd case:

distance(s)=256 km

speed=64km/ h

time=?

time=distance/speed

=256/64

=4hr

total distance = 144 km+256km

=400km

total time=4hr+4hr= 8hr

average speed= total distance travelled/total time taken

=400/8

=50km/h