Question

A train travels at a speed of 57 km/h for an hour and at a speed of 64 km/h for the next 3 hours. Find the average speed of his journey for 7 hours.​

Answer 1

Answer:

121 is answer

pleas make me brainless

Answer 2

first case.. time = 3 hours

and speed = 65km/h

so total speed = 65x3= 195km

in second case..

time = 2 hours

and speed = 70 km/ hours

so total speed = 2x70= 140 km

now average speed = total distance/ total time

140+195/3+2= 335/5= 67

67km/h.