Two motor boats A and B are in mid of river at distance 1km.If each motor boat can have max speed of 72kmph in still water ,then river flows with 24kmph . if boats start to move in downstream and upstream, the time after which boats will cross each other
1)25s
2)75s
3) 75/2s
4) 150s
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Explanation:
Speed of boat in upstream = 15 km/hr
Distance = 1.5 km
Time = t
1
=
15
1.5
= 6 min
Distance move by float in this time
5×
10
1
=
2
1
km
Speed of boat w.r.t. float,
20km/hr,t
2
=
20
2 km
= 6 min.
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