6
Q:
A) 4 hrs 10 min | B) 3 hrs 15 min |
C) 3 hrs 30 min | D) 4 hrs 1 min |
Answer: C) 3 hrs 30 min
Explanation:
Explanation:
Let the speed of boat and stream be x and y kmph respectively.
According to question
d/x+y + d/x-y = 5h 15m or 21/4 hrs ......(i)
and 2d/x-y = 7...... (ii)
From eq. (i) and (ii)
2d/x+y = 7/2
Hence, Amith will take to row 2d km distance downstream in 7/2 hrs
= 3.5 hrs
= 3 hrs 30 min.