SUBEX Company Numerical Ability Time Distance and Speed

A boat travel 20 km up stream in 6 hour and 18km down stream in 4hour . find the speed of boat in still water and speed of the water current.

(a) 47/12 kmph ; 7/12kmph (b) 53/12,5/12 (c)67/7,5/7 (d) 59/7 , 23/7

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SUBEX Other Question
A passenger train running at the speed of 80 km/h leaves the railway station 6 hour after good train leave overtake it in 4 hour , the speed of good train is ? Ravi and manish can do pieace of work in 16 and 20 days respectevey . how long it will take to finish the work if manish
replaced by sanjay after 2 days .Given sanjay and manish finish work togetherin 12days.

(a) 7.8 (b) 10.1 (c) 8 (d) 9.21