Question

A car completes a journey of 630 km in 9 hours 30 minutes The first one- third of the journey is completed at 50/3m/sec Find the speed for the rest of the journey

Answer 1

Heyaaa!!!
50/3 m/s------> 60km/hr
1/3rd journey=630km/3
=210 Kms!

So with 60 km to cover distance 210 km.. time taken=210/60
=3.5 hr!
so total time=9.5 hr(9 hr 30 min)
Remaining time=9.5-3.5=6 hrs!

Hope it helps!

Answer 2

distance = 630km
1/3of630km=210km
(50/3)m/sec=50/3*18/5=60kmph
time taken to travel 210km =210/6=3.5hr
time left is 9.5 - 3.5=6hr
left over distance = 630-210=420km
speed when travelling 420km= speed=distance/time=420/6=70kmph