Practice30Create account

A motorboat and a log set off together from P, going downstream. The boat (12 km/h in still water) reaches Q, 30 km away, in 2 hours. How far behind the boat is the log at that moment?

Competition practiceBoats & Streams
  • A24 km
  • B6 km
  • C30 km
  • D18 km

Step-by-Step Solution

Downstream = 15 km/h, so the current = 3 km/h. The log has drifted km. Gap = 30 − 6 = 24 km.
Answer: A) 24 km

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Boats & Streams practice questions

More Boats & Streams practice

A boat's speed in still water is 4.5 m/s and the stream flows at 0.5 m/s. How long does…After the monsoon, a river's speed rises from 2 km/h to 4 km/h. For a launch that moves…A boat goes 30 km downstream at 15 km/h and then 10 km upstream at 10 km/h. What is its…The table shows one trip each way for four ferries, each on a different river. On whose…A launch goes 28 km downstream in 2 hours, and its upstream speed is 60% of its…