Question

A cyclist goes from a place P to Q; first at 4 km/h and later at 5 km/h in 1 hour 24 minutes altogether. If the distances covered in the first and second part of the journey are in the ratio 2 : 1, when did the cyclist change his speed after start?

Answer 1

Answer:

1 hr

Step-by-step explanation:

total distance= 3x

given, 2:1 =

2x km at 4 km per hr

 x km at 5km per hr

  time= distance/speed

2x/4 + x/5 = 1 + 24/60

solve and u get,

x = 2

total distance= 3x= 3 x 2= 6 km

changes his peed after 4 km

 so, 4/4 = 1hr