Train A takes 1 hour more than train B to travel a distance

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SSC CGL Tier-2 19-February-2018 Maths
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M: +3.00/-0.00

Train A takes 1 hour more than train B to travel a distance of 720 km. Due to engine trouble speed of train B falls by a third, so it takes 3 hours more than Train A to complete the same journey? What is the speed of Train A (in km/hr)?

[SSC CGL Tier-2 19-February-2018 Maths]

A 80

B 90

C 60

D 70