Question

Preeti has to travel by a train which runs at a speed of 60 kmph or a bus that runs at 40 kmph, or both by travelling 420 km in 7:30 hours How long did he travel by that bus

Answer 1

Step-by-step explanation:

Know that speed is the distance covered by a moving object (a train in your case) in a unit time taken. It is a scalar quantity and hence can be represented by magnitude not direction. In other words, speed of an object is the rate of change of distance with time

Speed = distance traveled ÷ time taken

Distance = 504 km

Time = 4.5 hrs

Speed = (504÷4.5) km/hr

= 112 km/hr

But the SI Units of speed is m/s.

Noting that:

1km = 1000m, and

1 hr = 60 m = 3600 s

Therefore,

Speed = 112×3.6 m/s

= 403.2 m/s

Answer 2

Answer:

1.5 hours he travel by bus

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