Question

A man can row 6 kmph in still water. When the
river is running at 1.2 kmph, it takes him 1 hour to
row to a place and black. What is the total distance
travelled by the man ?
(A) 6.24 km
(B) 6 km
(C) 5.76 km
(D) 5.66 km​

Answer 1

Answer:

Step-by-step explanation:

LET THE DISTANCE BETWEEN 2 PLACES=x

Speed in downstream=6+1.2=7.2 kmph

Time in downstream t1=x/7.2 hr

Speed in Upstream=6-1.2=4.8 kmph

Time in Upstream t2=x/4.8 hr

t1+t2=1

x/7.2+x/4.8=1

x(4.8+7.2)=7.2*4.8

x=7.2*4.8/12=2.88 km

Total distance=2*2.88=5.76 km

option(C)