Tool By Zeal Point

Type 14: Average Speed with Stops

Q. A bus travels at a speed of 54 km/h without stopping and at an average speed of 45 km/h when it makes stops. How many minutes does the bus stop per hour ?

Formula:

$Speed with stops = Running Speed \times Running Time / Running Time + Stopping Time$

Solution:

Running speed = 54 km/h
Average speed with stops = 45 km/h

Let the bus run for t hours and stop for s hours.

$45 = 54t / t + s$

$45(t + s) = 54t$

$45t + 45s = 54t$

$45s = 9t$

$s = t/s$

For 1 hour:

$s = 1/5 hours$

$=1/5 \times 60 = 12 minutes$

Ans: 12 minutes per hour

=================================

PRACTICE SET – Speed with Stops

Q1. A bus travels at 60 km/h without stopping and at an average speed of 50 km/h when it stops. How many minutes does it stop per hour ?
A) 8 min B) 10 min C) 12 min D) 15 min

Q2. A train runs at 72 km/h without stops and at an average speed of 60 km/h including stops. How many minutes does it stop per hour ?
A) 8 min B) 10 min C) 12 min D) 15 min

Q3. A bus has a running speed of 48 km/h and an average speed of 40 km/h including stops. How many minutes does it stop per hour ?
A) 8 min B) 10 min C) 12 min D) 15 min

Q4. A car travels at 90 km/h without stopping and at an average speed of 75 km/h including stops. How many minutes does it stop per hour ?
A) 8 min B) 10 min C) 12 min D) 15 min

Q5. A bus runs at 80 km/h without stopping and its average speed including stops is 64 km/h. How many minutes does it stop per hour ?
A) 10 min B) 12 min C) 15 min D) 18 min