Question

3. A man travels 600 km by train at 80 km/hr. 800 km by ship at 40 km/hr. 500 km
by aeroplane at 400 km/hr and 100 km bycar at 50 km\hr. What is the average
speed for the entire distance​

Answer 1

Answer:

total distance:600+800+500+100

                      :2000

time taken by train:600/80

                              :6.25hrs

time taken by ship:800/40

                              :20hrs

time taken by aeroplane:500/400

                                        :1.25hrs

time taken by car:100/50

                            :2hrs

total time:6.25+20+1.25+2

              :29.5hrs

average speed=total distance/total time

                        =2000/29.5

                        =67.79

Explanation: