speed of a boat in standing water is 7 km/hr and the speed of the stream is 1.5 km/hr. A distance of 7.7 km. going upstream is covered in?

1 hr. 15 min.
1 hr. 12 min.
1 hr. 24 min.
2 hr. 6 min.

Correct Answer: 1 hr. 24 min.

Explanation:

Upstream speed = 7 - 1.5 = 5.5 km/hr
⇒ 5.5 x T = 7.7
∴ T = 77.7 / 5.5 = 1hr. 24 minutes

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