Question

A car travelled at a speed of 30 km/h during first part of his journey and at a speed of 45 km/h for the rest of the journey. if the jounrey took 6 hours and the car covered 245 km in all for how much time did it travel at 30 km/h

Answer 1

Answer:

Time taken for first journey=1.67hr

Step-by-step explanation:

Let the car travelled for first part of journey =x km

And rest of his journey =(245-x) km

Given total time taken=6 hrs

Ta+Tb=6

$speed = distance/time$

x/30+(245-x) /45=6

[45x+(245-x)30]/(30×45)=6

[45x+7350-30x]/1350=6

15x+7350=8100

15x=8100-7350

15x=750

x=50

time taken to travel at a speed 30km/h is

Ta=distance/speed

Ta=50/30

Ta=1.67hr