An automobile driver travels from plane to hill station 100 km distance at an average speedof 30 km per hour. He then makes the return trip at average speed of 20 km per hour. What is his average speed over the entire distance(200 km)?

An automobile driver travels from plane to hill station 100km distance at an average speedof 30km per hour.He then makes the return trip at average speed of 20km per hour.What is his average speed over the entire distance (200km)?

An automobile driver travels from plain to a hill station 120 km distant at an average speed of 30 km per hour. He then makes the return trip at an average speed of 25 km per hour. He covers another 120 km distance on plain at average speed of 50 km. per hour . His average speed over the entire distance of 360 km will be

An automobile driver travels from plane to a hill station, a distance of 120 km at an average speed of 30 km per hour. He then makes the return trip at an average speed of 25 km per hour. He covers another 120 km distance on plane at an average speed of 50 km per hour. His average speed over the entire distance of 360 km will be :

An automobile driver travels from plane to a hill station, a distance of 120 km at an average speed of 30 km per hour. He then makes the return trp at an average speed of 25 km per hour. He covers another 120 km distance on plane at an average speed of 50 km per hour. His average speed over the entire distance of 360 km will be :

An automobile driver travels from a plain to a hill station 120 km away at an average speed of 30 km per hour. He then makes the return trip at an average speed 25 km per hour. He covers another 120 km on the plain at an average speed of 50 km per hour. His average speed (in km/hr) over the entire distance of 360 km will be

An automobile driver travels from a plain to a hill station 120 km away at an average speed of 30 km per hour. He then makes the return trip at an average speed 25 km per hour. He covers another 120 km on the plain at an average speed of 50 km per hour. His average speed (in km/hr) over the entire distance of 360 km will be

An automobile driver travels from a plain to a hil station 120 km away at an average speed of 30 km per hour. He then makes the return trip at an average speed 25 km per hour. He covers another 120 km on the plain at an average speed of 50 km per hour. His average speed (in km/hr) over the entire distance of 360 km will be

An automobile driver travels from a plain to a hil station 120 km away at an average speed of 30 km per hour. He then makes the return trip at an average speed 25 km per hour. He covers another 120 km on the plain at an average speed of 50 km per hour. His average speed (in km/hr) over the entire distance of 360 km will be