16. A fisherman can row in still water at 5 kmph. The speed of the water is 1 kmph. He takes 1 hour to row to a place and reach the shore back. How far is the place from the shore?
a. 2.4 km
b. 2.5 km
c. 3 km
d. 3.6 km
Answer: a. 2.4 km
17. To row 2 km against the current, a boatman takes 60 minutes while it takes him just 10 minutes to row along the current. How long will he take to row 5 km, assuming that the water is still?
a. 40 min
b. 1 hr
c. 1 hr 15 min
d. 1 hr 30 min
Answer: c. 1 hr 15 min
18. The speed of a swimmer along the water current is 15 kmph. Water current is 2.5 kmph. Find his speed against the current.
a. 8.5 km/h
b. 9 km/h
c. 10 km/h
d. 12.5 km/h
Answer: c. 10 km/h
19. A boat covers same distance upstream and downstream both. The time take upstream is 8 hours 48 minutes while the time taken downstream is 4 hrs. Find (Speed of boat) : (Speed of water).
a. 2 : 1
b. 3 : 2
c. 8 : 3
d. Cannot be determined
