Question

please answer this physical question fast

Answer 1

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Answer 2

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Your solution

Distance travelled = 120 km

1st = 30 km with speed 30km/h

Time taken = Distance /Speed = 30/30 = 1hr

2nd Distance = 90 km

Let its time taken by train to cover is x

$av. \: speed \: = \frac{total \: distance}{total \: time \: }$

$60km {h}^{ - 1} = \frac{120}{1 \: + \: x}$

60 + 60x = 120

60x = 60

time taken is 1 hr