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1. Speed of a man in still water is 5 km/hr and the river is running at
3km/hr. The total time taken to go to a place and come back is 10
hours. What is the distance travelled?
A.10 km
B.16 km
C.24 km
D.32 km
E.36 km

Answer & Explanation
Answer – D.32 km
Explanation :
Down speed= 5+3= 8
Up speed= 5-3=2
Let distance travelled = X
(X/8)+(X/2)= 10
X= 16 km
Total distance is 16+16=32

2. A boat running upstream takes 9 hours 48 minutes to cover a
certain distance, while it takes 7 hours to cover the same distance
running downstream. What is the ratio between the speed of the
boat and speed of the water current respectively?
A.5:2
B.7:4
C.6:1
D.8:3
E.2:5

Answer & Explanation
Answer – C.6:1
Explanation :
Distance covered upstream in 9hrs 48 min = Distance covered downstream in
7hrs
(X-Y) 49/5=(X+Y)7
X/y=1/6

3. A man can row 8 km/hr in still water. When the river is
running at 4 km/hr, it takes him 2 1/3hr to row to a place
and come back. How far is the place?
A.4 km
B.5 km
C.7 km
D.10 km
E.None of these

Answer & Explanation
Answer – C.7 km
Explanation :
Downstream speed = 8+4= 12 => a
Upstream speed = 8-4= 4 => b
Distance = a*b/(a+b) * total time (t)
= 12*4/16 * 7/3
= 7kms

4. A boat goes 4 km against the current of the stream in 1 hour
and goes 1 km along the current in 10 minutes. How long
will it take to go 15 km in stationary water?
A.2 hour 15 min
B.2 hour
C.3hr
D.3hr 30 min
E.None of these

Answer & Explanation
Answer – C.3hr
Explanation :
Rate downstream = 1/10 * 60 = 6kmph
Rate upstream = 4 km/hr.
Speed in still water = ½ * 10 = 5 kmph
Required time = 15/5 = 3 hr

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