Question

The speed of a motorboat is 20 km/hr. For covering the distance of 15 km the boat took 1 hour more upstream than downstream.

How much time boat took in downstream?

Options

• 90 minute

• 15 minute

• 30 minute

• 45 minute

Answer 1

30 minute

Explanation:

Speed downstream = 20 + 10 = 30 km/hr

Distance = 15 km

Calculate time downstream:

TIme = `"Distance"/"Speed" = 15/30 = 0.5` hour

Convert to minutes:

0.5 × 60 = 30 minutes

Time taken downstream is 30 minutes.