a train 240 m long passes a pole in 24 seconds . how long will it take to pass a platform 650 m long ?
speed = ( 240 / 24 ) m / sec = 10 m / sec . therefore , required time = ( 240 + 650 ) / 10 sec = 89 sec . answer is e .
divide(add(240, 650), speed(240, 24))